function showImage(b_name, b_breite, b_hoehe) {
	var scnHeight; var scnWidth;
	var posX, posY;
	var f_breite, f_hoehe;
	var diff_hoehe, diff_breite;
	scnHeight = screen.height;
	scnWidth = screen.width;

	diff_hoehe = 60;
	diff_breite = 20;

	f_breite = b_breite+diff_breite;
	f_hoehe = b_hoehe+diff_hoehe;

	posX = (scnWidth-f_breite)/2;
	posY = (scnHeight-f_hoehe)/2;

	window.open(	"showImage.php?b_name="+b_name+"&b_breite="+b_breite+"&b_hoehe="+b_hoehe,
			"_blank",
			"toolbar=no,width="+f_breite+",height="+f_hoehe+",top="+posY+",left="+posX+",directories=no,status=no,scrollbars=no,resize=no,menubar=no")
}