function SimpleSwap(el,which)
	{el.src=el.getAttribute(which || "origsrc");}

function SimpleSwapSetup()
	{
  		var x = document.getElementsByTagName("img");
 		for (var i=0;i<x.length;i++)
		{
			var oversrc = x[i].getAttribute("oversrc");
    		if (!oversrc) continue;
 		   // preload image
 		   // comment the next two lines to disable image pre-loading
 		   x[i].oversrc_img = new Image();
 		   x[i].oversrc_img.src=oversrc;
		    // set event handlers		
		    x[i].onmouseover = new Function("SimpleSwap(this,'oversrc');");
		    x[i].onmouseout = new Function("SimpleSwap(this);");
		    // save original src
 		 }
	}

var PreSimpleSwapOnload =(window.onload)? window.onload : function(){};
window.onload = function(){PreSimpleSwapOnload(); SimpleSwapSetup();}