function toggleLayer(whichLayer)
{
  var elem, vis;
  if( document.getElementById )
    elem = document.getElementById( whichLayer );
  else if( document.all )
      elem = document.all[whichLayer];
  else if( document.layers )
    elem = document.layers[whichLayer];
  vis = elem.style;

  var i = 1;
  var info = "info";
  while (i < 9) {
  	varname = info.concat(i);
  	if( document.getElementById )
    	ele = document.getElementById(varname);
  	else if( document.all )
    	ele = document.all[varname];
  	else if( document.layers )
    	ele = document.layers[varname];
	vizi = ele.style;
	vizi.display = 'none';
  	i++;
  }
  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';
}