var subwindow 
function openSpec(i,w,h) {
  	
  	if(subwindow != null){
  	 	subwindow.close();
  	}
		mypage= 'td/' + i;
		myname='single_popup'
		settings='width='+w+',height='+h+',top=10,left=10,location=no,directories=no,status=no,menubar=no,scrollbars=yes,toolbar=no,resizable=yes,alwaysraised=yes,dependent=yes';
		subwindow = window.open(mypage, myname, settings);
	
	subwindow.focus();
}