var supersleight = function() {
 
 var root = false;
 var applyPositioning = true;
 
 // Path to a transparent GIF image
 var shim   = 'http://symphonythemes.com/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();