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Hide <span> until <div> is hovered over

I made this a couple of months back, but now I'm going through and re-tuning it. It's an image at the bottom of the page that when clicked it brings you to the top using JavaScript.
I already have the HTML, CSS and JS finished. But I can't get the CSS to work properly. I want a little message ("Scroll To Top") to remain hidden until the is hovered over, where it will appear.
I tried making a presentation here with JSFiddle, but it doesn't seem to want to work. (http://jsfiddle.net/9jvuoxra/1/)
Additionally Today I decided I want the image to become a background-image of the , but I can't get the to work correctly with {display: block;}. I've gotten it to work on other files in the past, but it doesn't want to work.
<!-- Scroll to the top option -->
<script>
function scroll () {
window.scrollTo (0, 0);
};
</script>
<div id="scroll-to-top">
<a onclick="scroll ()">
<span>Scroll To Top</span>
<img src="img/scroll-to-top.png" alt="Scroll To Top" title="Return to top">
</a>
</div>
<style>
div#scroll-to-top {margin-left: auto; width: 42px; height: 42px;}
div#scroll-to-top a {color: #ffffff;}
div#scroll-to-top a span {visibility: hidden;}
div#scroll-to-top a:hover span {visibility: visibile;}
div#scroll-to-top span {position: absolute; margin: 10px 0px 0px 0px; width: 42px; font-size: 10px; text-align: center;}
div#scroll-to-top img {display: block; width: 42px; height: 42px;}
div#scroll-to-top img:hover {cursor: pointer;}
</style>

scroll(X, Y) is already a defined javascript function, which is now replaced by the identical function scrollTo(X, Y), so using scroll() might not work always (as it is not working on jsfiddle). Instead you could write <a onclick="window.scrollTo(0, 0)"> to make it work.
For hiding the span, you may use jQuery.
Make sure to remove the visibility: hidden attribute also.
$(document).ready(function() {
// hide the span
$('#scroll-to-top span').hide();
// bind the hover event (mouseenter) to show the span and
// next hover event (mouseleave) to hide again
$('#scroll-to-top').hover(function(){
$('#scroll-to-top span').show();
}, function() {
$('#scroll-to-top span').hide();
});
});

I need these buttons to control which div is showing or "on top"

I have these buttons on the side of my page, and a main content area taking up the better part of the page.
What I am trying to do is get the button I click to change the main content to a div containing the corresponding information. This is very hard to find, perhaps because I am searching by the wrong terms, and I have covered a good portion of stackoverflow without much luck.
I have though about absolutely positioning the divs and using a script to change the z-index of the the divs to the highest amount using a "=+1" type situation, but I could see that getting messy.
I have considered adapting a script I have that replaces part of an image file name in order to change a main picture on a page to a larger version of the image corresponding to a thumb name, though this script targets file names so it isn't going well.
I have also tried something along the lines of:
"id of button" onclick function = "main content class" change id to "corresponding div"
only in javascript talk, and this isn't working at all so I can only assume that I am either looking at it wrong or I have some messed up in the code.
$('#tabhead1').click(function() {
document.getElementByClassName("maintab").id = "tabs1";
});
This is driving me crazy and I would really appreciate some ideas. I tried to leave it free formed so that noone gets hung up on anyone solution.
**** Just to clarify, I have 5 divs id'd at #tabhead1, #tabhead2, #tabhead3, etc. and 5 content divs classed as .maintab, and id'd as tabs1, tabs2, tabs3, etc. I need the first content div to show automatically, and for that div to change based on the button clicked. at the moment all content divs are set to display: none; except the first one.

For each button, add a data attribute related to the corresponding <div>
for example
<button id="tabhead1" data-content="tabs1" >first Tab</button>
apply a common class for the tabs, for example .tab
Then you can do the following
$('button').click(function(){
var contentId = $(this).data('content'); // get the id of corresponding tab
$('.tab').hide(); // hide all tabs
$('#'+contentId).show(); //show the corresponding tab
});

You are using getElementbyClassName which does not exists. Use:
document.getElementsByClassName("maintab")[0].id = "tabs1";
// Get all elements to match classname + get first element from array
And for the rest, I don't know why you want to add id with JS? Why not just add them to your HTML?

Try this
$('#tabhead1').click(function() {
// get element with class 'maintab' and replace its content with that of another tab
$(".maintab").html($(".tabs1").html());
});

To expand a little on the demo I posted in the comments earlier:
This uses a method very similar to #tilwin-joy, so I guess we were of like mindedness. There are a couple of small differences that I would point out:
jQuery:
$('button').on('click', function () {
var button = $(this);
var target = button.data('target');
button.prop('disabled', true).siblings().prop('disabled', false);
$(target).show('slow').siblings().hide();
});
This uses siblings to hide the other content (one less pass at the DOM).
I suggest just setting your data value with the id hash in the markup, I think it's a bit clearer to read and follow (IMHO) in both the script and markup.
This script also sets the current button to be disabled when clicked. The benefit of this is that you can use the disabled property to style up your buttons, and even if you don't style them it gives a visual cue to the user as to which tab content is currently displayed. Check out the demo to see how this can be used for styling purposes.
HTML: (I stripped some of the unneeded ids from what you described as your markup).
<div class="tabhead">
<button data-target="#tabs1" disabled="true">Content 1</button>
<button data-target="#tabs2">Content 2</button>
<button data-target="#tabs3">Content 3</button>
<button data-target="#tabs4">Content 4</button>
<button data-target="#tabs5">Content 5</button>
</div>
<div class="maintab">
<div id="tabs1">
<img src="http://placehold.it/350/e8117f/fff&text=Image+1" alt="Image 1" />
<p>This is the content of tabs1.</p>
</div>
<div id="tabs2">
<img src="http://placehold.it/350/9acd32/fff&text=Image+2" alt="Image 2" />
<p>This is the content of tabs2.</p>
</div>
<div id="tabs3">
<img src="http://placehold.it/350/9400d3/fff&text=Image+3" alt="Image 3" />
<p>This is the content of tabs3.</p>
</div>
<div id="tabs4">
<img src="http://placehold.it/350/ffd700/fff&text=Image+4" alt="Image 4" />
<p>This is the content of tabs4.</p>
</div>
<div id="tabs5">
<img src="http://placehold.it/350/1e90ff/fff&text=Image+5" alt="Image 5" />
<p>This is the content of tabs5.</p>
</div>
</div>
CSS: Not needed - just to give you an idea of how you can style the elements to look like tabs.
/*This sets all but the first tab to hidden when the page is loaded*/
.maintab>div:not(:first-child) {
display: none;
}
/*The rest is just to style the elements to look like tabs*/
body {
background-color: #eaeaea;
}
.maintab, .tabhead {
text-align: center;
margin:0 20px;
font-family: sans-serif;
}
.maintab {
border: 1px solid #1e90ff;
border-top: none;
padding-top: 20px;
background-color: #fff;
}
.tabhead {
border-bottom: 1px solid #1e90ff;
position: relative;
margin-top: 20px;
}
button {
background-color: #ccc;
padding: 10px;
border: 1px solid #999;
border-bottom: none;
-webkit-border-top-left-radius: 4px;
-webkit-border-top-right-radius: 4px;
-moz-border-radius-topleft: 4px;
-moz-border-radius-topright: 4px;
border-top-left-radius: 4px;
border-top-right-radius: 4px;
color: #999;
font-size: 14px;
cursor: pointer;
position: relative;
top: 2px;
}
button:disabled {
background-color: #fff;
border-color: #1e90ff;
color: #1e90ff;
top: 3px;
padding-top: 11px;
cursor: not-allowed;
z-index: 10;
}

Map not opening without refreshing page once closed

The website i am currently working on has a pop out div with a map of locations on it, my problem is once the pop up div has been closed i then have to refresh the page to open the div again
It is running jquery - here is the code
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#view_map_of_stocklists_link').click(function() {
//$('#popupdiv').show('slow');
$("#popupdiv").css('visibility', 'visible');
$("#mappy").css('opacity', '1');
});
$('.closepopup').click(function() {
$('#popupdiv').hide('slow');
});
});
</script>
The styling
<style>
#popupdiv
{
position: absolute;
left: 50%;
top: 50%;
background-color: white;
z-index: 100;
height: 600px;
margin-top: -200px;
width: 960px;
margin-left: -500px;
padding: 20px;
}
#view_map_of_stocklists_link:hover {
cursor:pointer;
}
.closepopup {
margin-top: 60px;
border: 1px solid #ccc;
background-color: #000;
color: white;
cursor: pointer;
}
</style>
and then the HTML itself
<div id="popupdiv" style="visibility:hidden;">
<center>
<iframe style="opacity:0;" id="mappy" src="http://mapsengine.google.com/map/embed?mid=zNedxWZ7lai0.krRxVqZZmyns" width="900" height="500"></iframe>
<div class="closepopup" style="width:200px">Close</div>
</center>
</div>
<h2 class="bold skin-font-color1">Our Beloved Stockists</h2>
<h5 class="skin-font-color1 p-wrapper"><!-- client txt --> <div id="view_map_of_stocklists_link" class="skin-font-color4">
<h4>View map of stockists</h4>
</div>
The website is http://www.tee-ze.co.uk/sosmoothies/
Cheers

You are setting 'visibility' to 'visible' instead of 'display' to 'block'.
When jQuery .hide() is called it ultimately saves the previous display value and sets it to display:none; So you should be doing something like:
$('#view_map_of_stocklists_link').click(function() {
$('#popupdiv').hide('slow');
});
Which I just realized you have commented out in your code. I wish I could leave a comment but I need more rep.
Edit:
Sorry for complaining in may previous answer.
I just tried uncommenting the existing code and removing the visibilty stuff and that works just fine in your site. Try it.

The way you're showing the popup map doesn't match the way you're hiding it.
You show it with:
$("#popupdiv").css('visibility', 'visible');
But you hide it with:
$('#popupdiv').hide('slow');
That fades it out but ultimately sets the CSS style display: none on the #popupdiv element.
When you try to show it again, it still has display: none on it. Setting the visibility doesn't affect the display style.
You need to make the hide and show match up. Either use the visibility style, or the display style, but use the same one for both hiding and showing (and jQuery's .show() method uses display).
For example, you might create the <div> with display: none instead of visibility: hidden, and then you can use jQuery's .show() and .hide() consistently.

How to display tooltip when mouse hover iframe

I'm using Telerik Radeditor which is rich text area and the editor content is an iframe, something like below:
<iframe frameborder="0"
src="javascript:'<html></html>';"
style="width: 100%; height: 100%; margin: 0px; padding: 0px;"
title="hello world"
id="contentIframe"></iframe>
My goal is to display the "hello world" tooltip when a user mouse hover the iframe area.
As you can see I put "title" attribute but it is not showing up.
To mimic the tooltip behavior I tried placing overlay div and title which worked but then I lost mouse control because of the overlay div.
I also desperately tried putting title in the iframe body but then I had to click inside of iframe to make it happen which is not the solution.
var iframe_html = $(wrapper).find("iframe").contents().find("html");
$(iframe_html).prop("title", "hello my tooltip 1");
var iframe = $(wrapper).find('iframe');
$(iframe).prop("title", "hello my tooltip 2");
var iframebody = $(iframe).contents().find('body');
$(iframebody).prop("title", "hello my tooltip 3");
I'm using jQuery UI 1.8.16 which does not come with Tooltip capability thus that cannot be an option..
Could anyone help me figure how to show the tooltip?

You are able to assign a title to the iframe but you wont be able to see it in the iframe.. Change the frameborder to "2" and move your cursor to it.. there you go..Title appears...
To see the title on iframe you must set the title of iframe content and not the iframe itself..
just like i've done below..
<iframe frameborder="0"
src="javascript:'<div id=\'hey\' title=\'Hello World\'>Helllo World</div>';"
style="width: 100%; height: 100%; margin: 0px; padding: 0px;position:relative;"
title="hello world"
id="contentIframe">
</iframe>
Alternatively..
using jQuery
$(document).ready(function () {
$("#contentIframe").contents().find("body").attr('title','Hello World');
});
This is a fiddle for your reference..

I just added an iframe to the div in the w3 schools tooltip tutorial (TryIt editor here) and it worked perfectly. To my surprise.
<!DOCTYPE html>
<html>
<style>
.tooltip {
position: relative;
display: inline-block;
border-bottom: 1px dotted black;
}
.tooltip .tooltiptext {
visibility: hidden;
width: 120px;
background-color: #994444;
color: #ffffff;
text-align: center;
border-radius: 6px;
padding: 5px 0;
/* Position the tooltip */
position: absolute;
z-index: 1;
bottom: 100%;
left: 50%;
margin-left: -60px;
}
.tooltip:hover .tooltiptext {
visibility: visible;
}
</style>
<body style="text-align:center;">
<h2>Proof of Concept</h2>
<p>This, cobbled from the W3 schools tutorial on CSS tooltips. I added an Iframe inside the div; one may still interact therewith, yet enjoy full tooltipitude.</p>
<p> So, move the mouse over the text below:</p>
<div class="tooltip">Hover over me
<span class="tooltiptext">Hello World</span>
<iframe height="600px" src="https://imgur.com/a/71J1gQZ" width="600px" ></iframe>
</div>
</body>
</html>
See it live here :
https://faustsstudy.blogspot.com/p/blog-page_14.html
but it requires support for data URIs.

jQuery slideUp() trouble

I am having trouble developing a jQuery 'object'. I would like div1 (Refer to image below) to be the background div with an image in (Using a background image). I would then like div 2 (Refer to image below) to overlay div 1, which I can do. However, as I have little experience with jQuery it's the next part I'm struggling with. I would like, when you hover on div 2, I use jQuery slideDown() / slideUp() to show and hide div 3 (Refer to image below). It also needs to not close as it slides up (as the cursor will no longer be on div 2). Only when you're no longer hovering over the whole object will it close. I hope this makes sense... I just don't know where to start. If any more info is needed please ask.

Something like this should do it I believe, or at least it gives you a starting ground to play around with, and improve further.
Markup
<div class="wrapper">
<div class="one"></div>
<div class="two"></div>
<div class="three"></div>
</div>
CSS
.wrapper {
float: left;
}
.one {
background-color: grey;
width: 100px;
height: 100px;
}
.two {
background-color: blue;
width: 100px;
height: 20px;
}
.three {
background-color: green;
width: 100px;
height: 100px;
display: none;
}​
JavaScript
$(function () {
$(".two").mouseenter(function (){
$(".one, .three").slideToggle();
});
$(".wrapper").mouseleave(function (){
$(".one, .three").slideToggle();
});
});​
A live example: http://jsfiddle.net/ZHxe5/1/