function descrWindow(url, w, h) {
	var props = '';
	var orig_w = w;
	var scroll = 'yes';
	var winl = (screen.availWidth - w) / 2;
	var wint = (screen.availHeight - h) / 2;

	if (winl < 0) { winl = 0; w = screen.availWidth -6; scroll = 1;}
	if (wint < 0) { wint = 0; h = screen.availHeight - 32; scroll = 1;}
	winprops = 'resizable=no,location=no,toolbar=no,menubar=no,directories=no,scrollbars=yes,height='+h+',width='+w+',top='+wint+',left='+winl;
	win = window.open(url, '', winprops);
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}