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jQuery history usage

I have created a webpage that uses jQuery to show and hide elements. The obvious problem now arose; the back and forward browser buttons don't work anymore as everything is loaded within a single location.
I know the answer lies within jQuery History but after busting my head for several hours on their website and examples given here on stackoverflow, I still cant manage to:
A) create a history entry (I think i got this covered but not 100% sure)
B) animate the page transition with my own function (displayed beneath)
This is the website: www.grommit.nl
There are 4 sub-pages that require a history entry when called upon.
This code shows the transition of the "wordpress page". The other pages work in a similiar way. (so far I have only managed to generalize the last part of the pageload with the "LoadPageContent" function, the bit before that is different with every page)
var LoadPageContent = function() {
$(".sceneBody").slideDown(function() {
$(".aftertitle").css('width', '4em');
$(".mediacontainer").fadeTo('0.3s', 1,)
});
$("#goWordpress").click(function () {
$("#homeScene").fadeOut(function () {
$("#wordpressMessage").fadeIn(function() {
$(this).delay(300).slideUp(function() {
$("#wordpressPage, #grommitFixed").slideDown(function() {
LoadPageContent();
});
});
});
});
});
this is the function that is currently working as a previous button within the DOM. I would like this function to execute when the previous button is clicked.
var goBack = function() {
$(".aftertitle").css('width', '0em')
$(".mediacontainer").fadeTo('0.3s', 0, function() {
$(".scenebody, #grommitFixed").slideUp(function() {
$("*[id*=Page]:visible").each(function() {
$(this).slideUp(function() {
$("#homeScene").fadeIn();
});
});
});
});
};

In html5 you have something called pushstate, that you can use to tell the browser what to go back to. Check out:
html pushstate

What are some ways to speed up an img swap in jquery / javascript?

I have a slightly vague question. I have the following in my code: http://jsfiddle.net/PMnmw/2/
In the jsfiddle example, it runs smoothly. The images are swapped quickly and without any hassle. When it is in my codebase though, there is a definite lag.
I'm trying to figure out why that lag is happening. The structure of the jquery is exactly the same as above. I.e. Inside the $(document).ready (...) function, I have a check to see if the user clicked on the img (based on the classname) and then I execute the same code as in the jsfiddle.
I'm at my wits end trying to figure out what to do here... Clearly I'm not doing the swap right, or I'm being very heavy handed in doing it. Prior to this, one of my colleagues was using AJAX to do the swap, but that seems to be even more heavy duty (a full fledged get request to get the other icon...).

I've modified your fiddle: http://jsfiddle.net/PMnmw/12/
Things I've optimized:
Created a variable for both img1 and img2, so that you won't have to navigate the DOM to reference those two images anymore, thusly improving performance.
Applied a click handler to the images themselves, so you don't have to search the children of the wrapper.
The basic idea was to reduce the number of jquery selections as much as possible.
Let me know if this helped speed things up.
$(document).ready(function() {
var img1 = $('#img1');
var img2 = $('#img2');
$(".toggle_img").click(function(e) {
var target = $(e.target);
if(target.is(img1)){
img1.hide();
img2.show();
}
else if (target.is(img2)) {
img2.hide();
img1.show();
}
});
});

Images that are not visible are normally not loaded by the browser before they are made visible. If there seems to be a problem, start by downloading an image optimizer like RIOT or pngCrush to optimize your images.
If it's only two arrows, you should consider joining them into a CSS sprite.
You could try not doing everything with jQuery, but it shouldn't really make that much difference.
Something like this maybe, with the hidden image loaded in JS and some traversing done outside jQuery (but that is probably not the problem, although the code seems overly long for a simple image swap?) :
$(document).ready(function() {
var img=new Image();
img.src='http://i.imgur.com/ZFSRC.png'; //hidden image url
$(".wrapper").click(function(e) {
if(e.target.className=='toggle_img') {
$('.toggle_img').toggle();
if (e.target.parentNode.childNodes[1].style.display=='none') {
console.log("hello");
} else {
console.log("goodbye");
}
}
});
});
FIDDLE
​

Hover function in js spills over

I have set up my page so that when the user hovers over an image a text shows up and some bubbles. There are eleven images of fish and each one has its own text and bubble. I made sure that there is no overlap in the divs containing the fish, but when one hovers over a particular image the text of some of the other images show up too. This is too distracting since the user would want to see one text at a time. How can I solve this issue? Here is the link to the page: http://arabic001.com/colors

I'm curious myself as to what the common solution is to this problem.
When I run across this situation I use hoverIntent plugin for jquery.
if you went this route, you would change each .mouseOver(),.mouseOut() to the following:
from this
$('#fishBlue').mouseover(function() {
$('#bubblesBlue').toggle('slow');
$('#textBlue').toggle('slow');
});
$('#fishBlue').mouseout(function() {
$('#bubblesBlue').hide('slow');
$('#textBlue').toggle('slow');
});
to this
$('#fishBlue').hoverIntent(function() {
$('#bubblesBlue').toggle('slow');
$('#textBlue').toggle('slow');
});
}, function() {
$('#bubblesBlue').hide('slow');
$('#textBlue').toggle('slow')
});
note
that the hoverIntent plugin requires at least jquery 1.5.1
other tip
I would abstract things a bit more, why rewrite the same thing for each fish.
perhaps use classes
$('.fish').hoverIntent(function() {
$(this).next('.bubble').toggle('slow');
$(this).next('.text').toggle('slow');
});
}, function() {
$(this).next('.bubble').hide('slow');
$(this).next('.text').toggle('slow')
});

Does setTimeout() have issues when that window isn't focused?

I'm working on a site that uses setTimeout() to do kind of a 'slideshow' with banners on my site. Everything works fine, I have the delay set to 10 seconds. The problem only occurs when I switch windows/tabs and do something else. When I come back, the function runs a ton of times I (assume) to catch up or something. Problem is, my screen starts flickering over and over to show all banners fading in and fading out.
Any ideas on a solution? I've noticed this in Google Chrome, I also know it happens in Firefox. Not sure about IE.
EDIT
Here is the snippet I'm dealing with. Sadly, it is part of a very large script and is connected to a very complicated HTML file.
I hope you can get an idea of what is going on here at least:
var lval=0;
var nval=1;
setHead = function(data) {
lval=nval;
var index=1;
$.each(data, function(name,value) {
if (Math.floor(Math.random()*index+2)==index+1) {
nval=index;
}
if (index==lval) {
$('.headmaster').find('img').fadeOut('fast');
//$('.headmaster').css('background-color',value.backgroundcolor);
$('.headmaster').find('a').attr('href',value.url);
$('.headmaster').animate({backgroundColor:value.backgroundcolor},'slow',function() {
$('.headmaster').find('img').attr('src',value.img);
$('.headmaster').find('img').fadeIn('slow');
});
}
index++;
});
setTimeout(function() { setHead(data); },10000);
}
arrayGet = function(arr,idx) {
$.each(arr, function(i,v) {
if (i==idx) {
return v
}
});
return null
}
$(document).ready(function() {
$.getJSON('json/intros.json', setHead);
});
I'm using jQuery for the animation and the color plugin for fading the colors.

It is happening probably because you are using an old version of jQuery. Namely the one where the dev team has started using requestAnimationFrame API. Fortunately, they fixed it in 1.6.3. Here is an extract from their blog:
No more animation “worm holes”: We had high hopes for the browser’s requestAnimationFrame API when we added support into version
1.6. However, one of the highest-volume complaints we’ve received since then relates to the way requestAnimationFrame acts when a tab is
not visible. All the animations initiated when the tab is invisible
“stack” and are not executed until the tab is brought back into focus.
Then they all animate at warp speed! We’ve removed support for this
API (which has no impact on the way you call jQuery’s animation
features) and plan to incorporate it into a future version of jQuery.
Simply update to 1.6.4.

jQuery Image Gallery stops working in IE7&8 after using for small period of time

I have the following code I am using for a photo gallery. In Internet Explorer 7 & 8 the gallery stops working. The image fades out after several clicks and the new image does not fade in. After this occurrence happens (about 6 or so clicks) the gallery does not function at all. All other browsers work flawlessly. I have also used this code in several other pages with no problems.
$("#list-image-carousel").find('a').click(function(e) {
e.preventDefault();
var src = $(this).attr("href");
$("#main-img").find('img').fadeOut(400,
function() {
$("<img/>").attr("src", src).load(function() {
$("#main-img").find('img').attr("src", this.src).fadeIn(400);
})
})
});
Any ideas are greatly appreciated. Thanks in advance!

Here's one possibility: it looks like you're establishing the "load" handler on your temporary image element after you're initializing the "src". That's a problem in IE - reverse the order of those things and see if that helps.
$("#main-img").find('img').fadeOut(400,
function() {
$("<img/>").load(function() {
$("#main-img").find('img').attr("src", this.src).fadeIn(400);
}).attr("src", src);
})
If the image is in the cache, then when you assign the "src" attribute IE will immediately ready the element. If there's no "load" handler defined at that point, it won't queue up the event at all.
Also, just as a note, the construct
$('#main-img').find("img")
could be written:
$('#main-img img')
Doing it like that is a little shorter, but in truth it may or may not actually be faster. Probably would be, I think.