var popUpWin=0;
function popUpWindow(URLStr, left, top, width, height, barras)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar='+barras+',location=no,directories=no,status=no,menub ar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}

function showPic (whichpic) { 
	 
		document.getElementById('placeholder').src = whichpic; 

}