var supersleight  = function() {

   var root = false;
   var applyPositioning = true;

   // Path to a transparent GIF image
   var shim       = '/i/t/lib/code/png/blank.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();