function popopen(iwidth,iheight,page) {
	screenwidth=screen.availWidth;
	screenheighth=screen.availHeighth;
	ttop=(screenheighth/2)-(iheight/2);
	lside=(screenwidth/2)-(iwidth/2);
	open(page,"window2","top="+ttop+",left="+lside+",height="+iheight+",width="+iwidth);
}