function winOpen(url, n, w, h, s) {
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+s+',resizable'
win = window.open(url, n, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}

function displayLayerReq(num,id_name){
   if( num == 2){
     document.getElementById(id_name).style.display ="block";
   }else{      
      document.getElementById(id_name).style.display ="none";
   }
}