function show_menu(_id)
{
	document.getElementById(_id).style.left = get_clientWidth();
	document.getElementById(_id).style.top = get_clientHeight();
	document.getElementById(_id).style.visibility = "visible";	
              
    document.getElementById('divMask').style.visibility = "visible";             
}

function hide_menu(_id)
{	
	document.getElementById(_id).style.visibility = "hidden";	
	document.getElementById('divMask').style.visibility = "hidden";   		
}

function get_clientWidth()
{
	var cW = (document.body.clientWidth)/2
	return cW-300;
}

function get_clientHeight()
{
	var cH = (document.body.clientHeight)/2
	return cH-200;
}


// Popup Windows
var popUpWin=0;
function popUpWindow(URLStr, left, top, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}