function preparelinks() {

  if (!document.getElementsByTagName) return false;
  
  var linkpics = document.getElementsByTagName("img");
 
  for ( var i=0; i < linkpics.length; i++) {
	if (( linkpics[i].getAttribute("class") == "rollover" ) || ( linkpics[i].getAttribute("classname") == "rollover" )){
            origsrc = linkpics[i].src;
            startext = origsrc.lastIndexOf(".gif") -1;
            newsrc = origsrc.substring(0, startext) + '3.gif';
            linkpics[i].onmouseover = new Function ("", "this.src = '"+ newsrc + "';")
            linkpics[i].onmouseout = new Function ("", "this.src = '"+ origsrc + "';")
	    }
	}	
}

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

// Start of main

addLoadEvent(preparelinks);