startPosX = screen.width/2-320;
startPosY = screen.height/2-320;
defaultWidth  = 640;
defaultHeight = 480;
var autoClose = true;
if (parseInt(navigator.appVersion.charAt(0))>=4){
	var isNN=(navigator.appName=="Netscape")?1:0;
	var isIE=(navigator.appName.indexOf("Microsoft")!=-1)?1:0;
}
var optNN='scrollbars=yes,width='+defaultWidth+',height='+defaultHeight+',left='+startPosX+',top='+startPosY;
var optIE='scrollbars=yes,width='+defaultWidth+',height='+defaultHeight+',left='+startPosX+',top='+startPosY;

function showExt(URL){
	var imageTitle = "Zum Schließen auf das Bild klicken";
	if (isNN){myWindow=window.open(URL,'',optNN);}
	if (isIE){myWindow=window.open(URL,'',optIE);}
}