// <script type="text/javascript" src="js/dropMenu.js"></script>
var valTimeOut =500;
var thisTime =thisLayer =0;

function showLayer(newLayer)
  {
	timerOff();                                     // stop timer
	if (thisLayer) hideLayer();                     // hide old layer
	thisLayer =document.getElementById(newLayer);   // set layer pointer
	thisLayer.style.visibility ='visible';          // show layer
  }

function hideLayer()
  {
	if (thisLayer) thisLayer.style.visibility = 'hidden';
  }

function timerOn()
  {
	thisTime =window.setTimeout(hideLayer, valTimeOut);   // start timer
  }

function timerOff()
  {
	if (thisTime)
	  {
		window.clearTimeout(thisTime);    // cancel timer
		thisTime =null;                   // clear layer pointer
	  }
  }
document.onclick =hideLayer;        // hide layer on click