function selectBox(m) {    
    var div = document.getElementById("checkboxList")
    var checkboxs = div.getElementsByTagName("input")
    for (var i = 0, n = checkboxs.length; i < n; i++) {
        if (checkboxs[i].getAttribute('id').indexOf('cbxSelect') > 0) {
            switch(m) {
                case 'i':
                    checkboxs[i].checked = !checkboxs[i].checked
                    break;
                case 'a':
                    checkboxs[i].checked = true
                    break;
                case 'n':
                    checkboxs[i].checked = false
                    break;
            }                         
        }
    }
}
function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  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';
}