Make images larger when clicked, and restores original size on next click, (depends on jQuery or similar library)

imgScaleToggle.js

// imgscale by tlehman: Fri 03/16/2012 
// toggles the size of images by some factor, defined as the variable "scale"
//
// NOTE: To change how much an image scales, just set the "scale" variable to 
//       some number, with 1.0 being 100%, 2.0 being 200% ... etc
//      

// select images 
var imgs = $("img");


// to be attached to each image's onclick event
function imgScaleToggle() { 
    // get current image size
    var h=$(this).height(); 
    var w=$(this).width(); 
    // scale determines how much the image is to be magnified
    var scale = 2.0;

    // check if image has been clicked before
    if($(this).hasClass("clicked")) {
        var factor=1/scale;
        $(this).removeClass("clicked");
    } else {
        var factor=scale;
        $(this).addClass("clicked");
    }
    $(this).css("height", h*factor); 
    $(this).css("width", w*factor); 
}

// attach the handler to all of the selected images' onclick methods
imgs.click( imgScaleToggle );

Thanks man, gonna try it on my website!