function getElement(elementId) {
 var elem;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( elementId );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[elementId];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[elementId];
    
  return elem;
}

//from http://www.netlobo.com/div_hiding.html
function toggleLayer( whichLayer )
{
  var elem = getElement(whichLayer);
   
  var vis = elem.style;
  // if the style.display value is blank we try to figure it out here
  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)
    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';
  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function checkAll(theForm, cName, allNo_stat) {
	var n=theForm.elements.length;
	for (var i=0;i<n;i++){
		if (theForm.elements[i].className.indexOf(cName) !=-1){
			if (allNo_stat.checked) {
				theForm.elements[i].checked = true;
			} else {
				theForm.elements[i].checked = false;
			}
		}
	}
}