function openBildergalerie() {
	winHeight = 750;
	winWidth = 1020;
	
	winTop = Math.round( ( screen.height - winHeight ) / 2 );
	winLeft = Math.round( ( screen.width - winWidth ) / 2 );
	
	winOptions  = '';
	winOptions += 'height=' + winHeight + ',';
	winOptions += 'width=' + winWidth + ',';
	winOptions += 'top=' + winTop + ',';
	winOptions += 'left=' + winLeft + ',';
	winOptions += 'scrollbars=yes,';
	winOptions += 'location=no,';
	winOptions += 'menubar=no,';
	winOptions += 'resizable=yes,';
	winOptions += 'status=no,';
	winOptions += 'toolbar=no';
	
	imageWindow = window.open ( 'http://213.241.158.130/wbv/index.asp', 'imageWindow', winOptions );
	imageWindow.focus();
	
}