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reactivating :active on stylesheet

So I've got some convoluted code I'm working with and I need a help on a couple of finishing touches.
I have :active set in CSS so that it changes the color of a div element to a brighter color when you click on it. Later on in the code, it changes the div via JavaScript .style.backgroundColor.
I noticed that after this, it no longer honors the :active color. I was wondering if there was a way to restore or revert this, so that it always has the :active brighter color activated when you click it, even though I manually change its bg color through JavaScript.
General example:
CSS:
#div1{ background-color:black; };
#div1:active{ background-color:blue; };
JS:
document.getElementById("div1").style.backgroundColor="red";
The :active in the CSS (when clicked basically)no longer turns blue after the JS turns it red. How would I go about fixing this?

Two ideas come to mind.
Easy but a bit hacky, add !important so you have:
#div1:active{ background-color:blue!important; };
Instead of setting CSS directly via JS, instead add a class, like "bg-blue", then you can add a CSS line like:
.bg-blue:active { background-color:blue; }

CSS on SAPUI5 Controls

I have a sap.m.Input inside a div tag in HTML view of sapui5. When I apply css to the div, it works fine on all the div elements. However, I want to apply css on a single control inside the div tag. It is not working. The code is :
<div data-sap-ui-type="sap.m.Label" data-text="Sr.No :"></div>
<div data-sap-ui-type="sap.m.Input" id="id_SrNo_Val" data-width ="10%"></div>
The above code does not work if I apply css to the input. It works fine on the label. I am trying to reduce the height of the input. It works on Chrome console with runtime id. However I want to apply css with the given id which it does not accept.
Please help.

In SAPUI5 we don't know at which point time of CSS is applied to the Controls.
So you've to give "priority to your css class or id" which can be achieved using the property !important
Add your CSS property like following
#id_SrNo_Val {
height : 10px !important;
color : blue !important;
}
Use anything you want with !important property.
Update: Avoid !important because it'll become harder to debug at some point of time. Also in CSS, it's not suggested to use.

You may assign additional class to a control adding class="yourStylingClass" attribute.
You shouldn't use control ids for styling, since SAPUI5 may modify those, add prefixes etc.

Getting rid of background properties

I'm scraping this news website: http://www.nu.nl/
If you open console and type:
$('*').css('background', 'none');
You will see all the background properties being removed, except for one which is the "blue" squire in the first article. When I trace the original CSS I see it has the !important declaration assigned to it. I don't know whether this is causing its persistence. What can I try to get rid of that blue background in terms of Jquery and Javascript or CSS?
Please note I don't want to target the element itself but rather keep using the all (*) selector or some Javascript equivalent.

jQuery doesn't recognize the !important attribute in css definitions. You just need a more specific hierarchical selector here. Simply make a new class, and then use addClass.
$('head').append('<style type="text/css">html #page .noBG{ background:none !important; }</style>');
Then just add that class to everything.
$('*').addClass('noBG');
Edit
Based on comments below, you could try
$('head').append('<style type="text/css">html body#noBG *{ background:none !important; }</style>');
Then add the ID to the body
$('body').prop('id', 'noBG');
Which is a pretty specific selector. Some rules may still pass this, and you'll have to experiment with different variations depending on the scenario.

Help changing image slider from img's to li's

I've spent numerous hours trying to figure out how to get this slider to use li's with background images rather than img's.
The reason for this is that I intend to use the slider for Wordpress & many Wordpress themes apply their own css properties to images (such as 'max-width') which will often break the slider. I would appreciate if anyone could check out the following scripts and change it to work with li's :) I've been trying myself but for some reason all it would do is load forever never showing any images..
Here is the script:
http://pastebin.com/8J9uwRtZ
In the meantime I will continue to try figure this out myself. I would appreciate if anyone could help me out.
Here is a test site with an example of the slider not working with the theme 'Thematic' which applies a 'max-width' of 100% to images & an example of a theme which doesn't (hence the slider works perfectly). FYI removing the max-width from 'Thematic' & other themes fixes the slider everytime so this is definitely the problem; hence why I wish to use li's instead of img's.
http://www.matthewruddy.com/demo/ <- not working
http://www.matthewruddy.com/demo/?preview=1&template=twentyten&stylesheet=twentyten&TB_iframe=true <- working
Thanks to anyone who can help! Matthew.

As akonsu said, your best bet is applying a specific image style to the lof class. The default style defined by the themes image.css file only gets applied for.. you guessed it.. default images. Properly redefining it in the lof class will overwrite that rule and use the new style. If your browser still doesn't seem to be picking it up, throw a big fat !important to the end of the style rule and everything except IE6 will pick it up just fine.
Max-width is only applied to images with no other specific rules present, hence "cascading" style sheets. CSS rules marked !important take precedence over other rules for the same type. Normally in CSS the rules work from top to bottom, so if you assigned a new style to an element further down the style sheet or in a secondary style sheet then the later rule would take precedence. !important ensures that this rule has precedence. ie:
p { color: blue !important; }
.container h3 { do stuff }
.container p { color: red; }
In every browser except IE6 the font color for all paragraph elements will be blue as long as your doctype is properly set and your not getting tossed into quirks mode. However, doing something like this:
p { color: blue; }
.container p { color: red !important; }
Will show a red font color for all paragraph elements in the container only, for all browsers. This works because even if IE6 doesn't understand the !important rule, it still fully understands cascading rules and will apply the style based on what was last defined.
So in your case, the following rule works just fine and fixes your display problems in IE:
ul.lof-main-wapper li img { max-width: none !important; }

When styling sIFR 3, When should I use JavaScript/CSS/Flash?

I'm using sifr for the first time today. I have it up and running; however, I need some help. Rather than explain, I'll show you the code below:
<div id="pullquote">“Fantastic property, facilities and location. We
couldn’t have asked for more!” <em>Mr & Mrs. Smith</em></div>
So far, so good. I have then styled that in the same document in case flash/JavaScript is disabled. No problem.
sIFR.replace(journal, {
selector: 'div#pullquote',
wmode: 'transparent',
css: [
'.sIFR-root { text-align: center; color: #be7705; font-size: 30px; background-color:#fdefd4; }',
'em { font-style: normal; color: #1d5d69; font-size: 26px; }']
});
That's what is included in my JavaScript file. Am I correct in styling the element like this? I got slightly confused with the selector, then using a second selector within js-css. Once again, there is also sifr.css. What should be included in this document? Should I be styling the element here?
I suppose my question is: What should be included, and what styling should be done in sifr-config.js and what styling should be done in sifr.css?
Thank you :)

In the CSS for the HTML page (sifr.css) you can add a style to hide the elements that sIFR will replace before does so, and you can do some tuning of the text so the text size maps better to the Flash font.
The selector parameter for sIFR.replace() is used to select the elements you wish to replace by sIFR.
The css parameter contains the CSS used inside the Flash movie. At this point, all CSS selectors are relative to the element you replaced, so if you replace an h1#foo, then you select em rather than h1#foo em. This is the only place you can style the text inside the Flash movie, aside from font size, which, if not specified here, is derived from the font size of the replaced element.