// set items visibility using 
// specific browser technology
function ShowFilter(val) {
   // get specific div item, identified by node index
    var itm = document.getElementById(val);
    itm.style.display="block";
}

function HideFilter(val) {
   // get specific div item, identified by node index
    var itm = document.getElementById(val);
    setTimeout("",500);
    itm.style.display="none"
}