snippetsmania.com
Post and share your code snippets

var supersleight	= function() {

var root = false;
var applyPositioning = true;

// Path to a transparent GIF image
var shim			= 'x.gif';

// RegExp to match above GIF image name
var shim_pattern	= /x.gif$/i;

var fnLoadPngs = function() {
if (root) {
root = document.getElementById(root);
}else{
root = document;
}
for (var i = root.all.length - 1, obj = null; (obj = root.all[i]); i--) {
// background pngs
if (obj.currentStyle.backgroundImage.match(/.png/i) !== null) {
bg_fnFixPng(obj);
}
// image elements
if (obj.tagName=='IMG' && obj.src.match(/.png$/i) !== null){
el_fnFixPng(obj);
}
// apply position to 'active' elements
if (applyPositioning && (obj.tagName=='A' || obj.tagName=='INPUT') && obj.style.position === ''){
obj.style.position = 'relative';
}
}
};

var bg_fnFixPng = function(obj) {
var mode = 'scale';
var bg	= obj.currentStyle.backgroundImage;
var src = bg.substring(5,bg.length-2);
if (obj.currentStyle.backgroundRepeat == 'no-repeat') {
mode = 'crop';
}
obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='" + mode + "')";
obj.style.backgroundImage = 'url('+shim+')';
};

var el_fnFixPng = function(img) {
var src = img.src;
img.style.width = img.width + "px";
img.style.height = img.height + "px";
img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')";
img.src = shim;
};

var addLoadEvent = function(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
if (oldonload) {
oldonload();
}
func();
};
}
};

return {
init: function() {
addLoadEvent(fnLoadPngs);
},

limitTo: function(el) {
root = el;
},

run: function() {
fnLoadPngs();
}
};
}();

// limit to part of the page ... pass an ID to limitTo:
// supersleight.limitTo('header');

supersleight.init();

source