var popUpWin=0;
function popUpWindow(URLStr, width, height, left, top) {
	if(popUpWin) {
		if(!popUpWin.closed) popUpWin.close();
	}
	if (width==null) width=400;
	if (height==null) height=300;
	if (left==null) left=20;
	if (top==null) top=20;
	var popUpArgs="toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=yes, width="+width+", height="+height+",left="+left+", top="+top+", screenX="+left+", screenY="+top+"";
	popUpWin=open(URLStr, 'popUpWin', popUpArgs);
}