var class_front = "cfront";
var ie = (document.all) ? true : false;

function hideClass(objClass){
var elements = (ie) ? document.all : document.getElementsByTagName('*');
 for (i=0; i<elements.length; i++){
  if (elements[i].className==objClass){
    elements[i].style.display="none"
    }
  }
}
                  
function show_FrontID(objID){
  hideClass (class_front);
//  alert(objID);
  var element = (ie) ? document.all(objID) : document.getElementById(objID);
    element.style.display="block"
}