function rolfb(){
if(document.getElementById) {
var links=document.getElementsByTagName("a");
for(i=0;i<links.length;i++){
if (links[i].getAttribute("id")){
        links[i].onmouseover=showr;
        links[i].onmouseout=hider;
}}}}

function showr(event){
document.getElementById("a"+this.getAttribute("id")).style.backgroundColor="#484B7C";
}

function hider(event){
document.getElementById("a"+this.getAttribute("id")).style.backgroundColor="";
}