var IE4 = false, NS4 = false, NS6 = false, DOM = false;

if ((navigator.appName == "Netscape") && (navigator.appVersion.substring (0, 1) == "4")) NS4 = true;
if ((navigator.appName == "Netscape") && (navigator.appVersion.substring (0, 1) >= "5")) NS6 = true;
if ((document.all) && (navigator.userAgent.indexOf ('MSIE 4') >= 0)) IE4 = true;
if (document.getElementById) DOM = true;

var ie4 = IE4, ns4 = NS4, ns6 = NS6, dom = DOM;

function openWin (winname, location, winwidth, winheight, scrollbars)
{
	if (scrollbars == "") { scrollbars = ",scrollbars=no," } else { scrollbars = "," + scrollbars + "," }
	fenster = window.open('', winname, 'width=' + winwidth + ',height=' + winheight + scrollbars + 'resizable=yes,toolbar=no,status=no,directories=no,menubar=no,location=no');
	fenster.moveTo(screen.width/2-(winwidth/2),screen.height/2-(winheight/2));
	fenster.location.href = location; // muss sein wg. IE-Bug...
	fenster.focus()
}