function smartRollover() {  
    if(document.getElementsByTagName) {  
        var images = document.getElementsByTagName("img");  
        for(var i=0; i < images.length; i++) {  
            if(images[i].getAttribute("src").match("_f."))  
            {  
                images[i].onmouseover = function() {  
                    this.setAttribute("src", this.getAttribute("src").replace("_f.", "_o."));  
                }  
                images[i].onmouseout = function() {  
                    this.setAttribute("src", this.getAttribute("src").replace("_o.", "_f."));  
                }  
            }  
        }  
    }  
}  
if(window.addEventListener) {  
    window.addEventListener("load", smartRollover, false);  
}  
else if(window.attachEvent) {  
    window.attachEvent("onload", smartRollover);  
}