How To Resize Images With The Browser Window

I'm making a portfolio layout with images in a list (grid view), and I½m working with an fixed-fluid width on my #wrapper (max-width: 1075px; min-width: 960px; ). This works fine as long as Im showing full width, but when Im resizing the browser window the img thumbs floats down an leave a gap on the right side (the <li> is set to float:left; ) (as well as it should). But this is not the effect Im after, I want the img thumbs to resize with the browser window, and I have managed to do that width CSS (example: width: 28.1%; ). But I want a hover effect with text over the images (and that makes a mess out of %), so now Im looking for a script that can do the resizing for me because I can't use % on the image if I want that effect; and that I DO!So do anybody knows about a script that can help me with my problem?Specifics:I'm no wizard in .js so it would be fine if it is well documented on how to implement It should be possible to direct to only img with a certain class (don't want all my images to go bananas when resizing )Maybe control image size in css?And of course keep correct image dimensions!I'm not sure if this matters but; this portfolio is going to be implemented in WordPress.

because this problem makes me kinda crazy !Also: come over this gallery when I was searching after a solution, so here you can see an example on what I want (it also almost have the hover effect I want in mine to), resize your browser window and see the effect: http://bestwebgallery.comI hope I have explained what Im after clearly enough, my English (writing) is sadly not the best.