function smartRollover() 
{  
    if(document.getElementsByTagName) 
	{  
        var images = document.getElementsByTagName("img");  
        for(var i=0; i < images.length; i++) 
		{  
            if(images[i].getAttribute("src").match("_off."))  
            {  
                images[i].onmouseover = function() 
				{  
                    this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));  
                }  
                images[i].onmouseout = function() 
				{  
                    this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));  
                }
            } 
        }  
    }  
} 

if(window.addEventListener) 
{  
    window.addEventListener("load", smartRollover, false);  
}  
else if(window.attachEvent) 
{  
    window.attachEvent("onload", smartRollover);  
}