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how to Hide a div when css is disabled?

i have a div which is hidden initially and will be visible later depending on some click events results.
I have wrote this
$(document).ready(function () {
$('#<%=disable.ClientID %>').hide();
});
<div id="disable" runat="server">The following question is disabled</div>
But when i disable CSS it appears, when i don't disable css it gets invisible. how do i make this invisible even when css is disabled and visible later again

There is no way to make something invisible without CSS. But you can remove it:
$(document).ready(function () {
$('#<%=disable.ClientID %>').remove();
});
You would then need to readd all the mark up again should you wish to show it again.
Edit
You could do something like this:
$(document).ready(function () {
var item = $('#<%=disable.ClientID %>');
$(document).data('myElement', item.clone());
item.remove();
});
then you could re-add it
$(document).append($(document).data('myElement'));

If you are willing to write server code for this, then you could do this in the code-behind.
// c#
if(some condition...)
{
disable.Visible = false;
}
This will remove the div from the HTML output of the page.

I do not get you when talking about enabling and disabling css, but you can always manage the DOM elements via DOM manipulation. As you tagged jQuery:
$(document).ready(function () {
/* please try top avoid mix server side variables and javascript code */
$('#myTargetDiv').hide();
$('#myToggleButton').on('click',function(){
/* select the elements you want to hide / show with the click on this element */
var $elements = $('#myTargetDiv');
$elements.toggle();
});
});

Keep the hover state on the last clicked menu item

I have added a nice (jquery + css) navigation menu to my website, but there's a small problem. When I click on a menu item, the light blue box jumps back to the first item, and I would like the box to stay on the clicked item, but I have no clue how to make it happen.
Here's an example: http://jsfiddle.net/Stylock/ta8g4/
In that example, it actually works how I want, but on my website it doesn't work for some reason. Any help would be much appreciated.

You could add a class to the item like .selected
And in your css you apply the same style to the .selected than the :hover
http://api.jquery.com/addClass/
Or you cloud also modify the css using jQuery. But the first solution is more flexible.
Edit: Use the callback function to add/remove class, after your effect

This might be a solution to the right direction:
Onclick check if the menu already has a classname to get the background changed
remove that class from there
Add the class where you clicked
some minor css changes are needed and u will have solved it
have a great day

you can add a class when other page loads like to add on all pages like
this is bad one
<script type="text/javascript">
$(window).load(function () {
$("#index").toggleClass("highlight");
});
$(window).unload(function () {
$("#index").toggleClass("highlight");
});
</script>
site i used this at http://www.hoteloperaindia.com/
or like this short one to add this to master page
<script>
$(function () {
var loc = window.location.href; // returns the full URL
if (location.pathname == "/") {
$('#home').addClass('active');
}
if (/index/.test(loc)) {
$('#home').addClass('active');
}
if (/about/.test(loc)) {
$('#about').addClass('active');
}
if (/accommodation/.test(loc)) {
$('#accommodation').addClass('active');
}
if (/gallery/.test(loc)) {
$('#gallery').addClass('active');
}
if (/tariff/.test(loc)) {
$('#tariff').addClass('active');
}
if (/facilities/.test(loc)) {
$('#facilities').addClass('active');
}
if (/contact/.test(loc)) {
$('#contact').addClass('active');
}
});
</script>
site where i used this one http://rtshotel.in/
change it with your code

close previous opened div if a div is already opened

Will try to explain what i mean :)
I have two hidden divs that opens with jquery, they both works quite good... when I'm using them separated... But if I open the div when the other one is open, the first one keeps being open in the background... I would like that one to close.
Is there an if else function i can use ?
This is what i have so far.
$(document).ready(function(){
$(".contactDiv").hide();
$(".show_hide_contact").show();
$('.show_hide_contact').click(function(){
$(".contactDiv").slideToggle();
});
});
$(document).ready(function(){
$(".loginDiv").hide();
$(".show_hide_login").show();
$('.show_hide_login').click(function(){
$(".loginDiv").slideToggle();
});
});
I have created a jsfiddle to show some more.
http://jsfiddle.net/h2Hfg/

Just slide the other div too:
$('.show_hide_contact').click(function() {
$(".contactDiv").slideToggle();
$(".loginDiv").slideUp();
});
$('.show_hide_login').click(function(){
$(".loginDiv").slideToggle();
$(".contactDiv").slideUp();
});
Very nice of you to include the jsFiddle :)

I am not sure there is a function exactly that does that but you can do it manually. Check it out
$(document).ready(function(){
$(".contactDiv").hide();
$(".loginDiv").hide();
$(".show_hide_contact").show();
$(".show_hide_login").show();
$('.show_hide_contact').click(function(){
$(".loginDiv").hide();
$(".contactDiv").slideToggle();
});
$('.show_hide_login').click(function(){
$(".contactDiv").hide();
$(".loginDiv").slideToggle();
});
});

Found out how to.
I just added the hide function to the divs.
$('.show_hide_contact').click(function(){
$(".contactDiv").slideToggle();
$(".loginDiv").hide(); /* there is hiding prev opened tag*/
});

find ID of parent DIV and fade DIV out

Im trying to fade out a DIV when clicking a link within the DIV itself. Here is my code:
$(".hideinfo").click(function () {
var parentLink = $(this).parent().parent();
$(parentLink).fadeTo("slow", 0);
});
The reason I'm not specifying the ID directly is because I want to use this to fade out multiple DIVs with different ID's.
The above code was returning the ID when I setup an alert but not fading the DIV out or anything else I tried to so... any help here would be appreciated. The HTML is:
<div id="First-Block" class="item">
<p>text here</p>
<p>Back</p>
</div>
Thank you!

You should use fadeOut("slow") instead.
Try changing your code to:
$(".hideinfo").click(function () {
var parentLink = $(this).parent().parent();
$(parentLink).fadeOut("slow");
});
To improve this even further you can shorten your code to:
$(".hideinfo").click(function() {
$(this).closest(".item").fadeOut("slow");
});
Just to mention as well that by clicking on an anchor it will jump to the top of the page using #. I would take a look at .preventDefault()
You can also check out the API here -> http://api.jquery.com/fadeOut/

Use fadeOut() instead since your primary goal is to affect the overall visibiltity not a given opacity.

jsBin demo
$(".hideinfo").click(function( e ){
e.preventDefault(); // prevent default anchor link behavior
$(this).closest('.item').fadeTo(400, 0);
});
Additionally try to wrap the above into a document ready :
$(function(){
// code here.
});

jQuery custom menu

every jQuery plugin I've found is based on <li> elements to generate the menu items.
I have <div id = "menubutton"> element that represents the menu button and another, not-related (maning it is not a child) <div id = "menucontent"> that contains the menu items (mixed stuff, images etc). I want this second, hidden div to appear when I click on the button. it should hide back when i leave the button OR when i leave the content div, in case i'm selecting items or doing stuff there.
Now, this is the code I have so far, but the clearTimeout thing doesn't seem to work. Any help? Pointing out a plugin to help my work would work as well.
Thanks!
var timer;
$('#menubutton').click(function() {
$('#menucontent').show();
});
$('#menubutton').mouseout(function() {
timer = setTimeout('$("#menucontent").hide()', 500);
});
$('#menucontent').mouseover(function() {
clearTimeout(timer);
}).mouseout(function() {
setTimeout('$("#menucontent").hide()', 300);
});
EDIT SOLUTION
I solved the problem using hover insted of mouseover / mouseout

Try this:
$('#menubutton').click(function() {
$('#menucontent').show();
});
$('#menubutton').mouseout(function() {
$(this).data('myTimer', setTimeout('$("#menucontent").hide()', 500));
});
$('#menucontent').mouseover(function() {
clearTimeout($(this).data('myTimer'));
}).mouseout(function() {
setTimeout('$("#menucontent").hide()', 300);
});