function initRollovers(){ 
	if (!document.getElementById) return; 
  
	var aPreLoad = new Array(); 
	var sTempSrc; 
	var aImages = document.getElementsByTagName('img'); 
 
	for (var i = 0; i < aImages.length; i++){   
 		if (aImages[i].className == 'imgover'){ 
   			var src = aImages[i].getAttribute('src'); 
   			var ftype = src.substring(src.lastIndexOf('.'), src.length); 
   			var hsrc = src.replace(ftype, '_act'+ftype); 
 
   			aImages[i].setAttribute('hsrc', hsrc); 
    
   			aPreLoad[i] = new Image(); 
   			aPreLoad[i].src = hsrc; 
    
   			aImages[i].onmouseover = function(){ 
    			sTempSrc = this.getAttribute('src'); 
    			this.setAttribute('src', this.getAttribute('hsrc')); 
   			}  
    
   			aImages[i].onmouseout = function(){ 
    			if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_act'+ftype, ftype); 
    			this.setAttribute('src', sTempSrc); 
   			} 
  		} 
 	} 
}  
window.onload = initRollovers;