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].className;
    if (oversrc == "oversrc") {
    
    // preload image -
    // comment the next two lines to disable image pre-loading
	// imaj uzantisi ve ismi ayiriliyor. bu bilgilerle oversrc degeri ataniyor.
	xs = x[i].src.toLowerCase();
	s = xs.length;
	b = xs.substr(0, s-3);
	u = xs.substr(s-3, s);
	o = b+'2.'+u;
	
	x[i].setAttribute("oversrc",o);
    x[i].oversrc_img = new Image();
    x[i].oversrc_img.src=o;
	
    // set event handlers
    x[i].onmouseover = new Function("SimpleSwap(this,'oversrc');");
    x[i].onmouseout = new Function("SimpleSwap(this);");

    // save original src
    x[i].setAttribute("origsrc",x[i].src);
	}
  }
}

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