function popup(myname, mypage, mywidth, myheight, scroll) {
	var winl = (screen.width - mywidth) / 2;
	var wint = (screen.height - myheight) / 2;
	winprops = 'height='+myheight+',width='+mywidth+',top='+wint+',left='+winl+',resizable=1,scrollbars='+scroll;
	win = window.open(mypage, myname, winprops);
	win.window.focus();
}