function popUp(id,w,h) {
		cX = Math.floor((screen.availWidth-w)/2); 
		cY = Math.floor((screen.availHeight-h)/2);
		myWin = window.open('popup.php?id='+id,'','toolbar=no, location=no, status=no, menubar=no, scrollbars=yes, resizable=no, width='+w+', height='+h+', left='+cX+',top='+cY);
		myWin.focus();
	}