window.onload = start;

function start() {
	var uebersicht = document.getElementById('uebersicht');
	var uebersicht_a = uebersicht.firstChild;
	uebersicht_a.onclick = popup;
	/* uebersicht.tastendruck ?? */
}

function popup() {
	// Breite festlegen
	var img_width = 400;
	// Breite und Hoehe auslesen
	var img = this.firstChild;
	// Verhaeltnis Vorschaubild zu endgueltigem Bild
	var ratio = img_width / img.width;

	var pop_left = screen.width - (img_width + 20);
	var pop_height = img.height * ratio + 170;

	var attrib = "toolbar=no, location=no, directories=no, status=yes, menubar=no, scrollbars=no, resizable=yes, width=400, height=" + pop_height + ", top=10, left=" + pop_left;
	window.open(this.href, 'lageplan', attrib);
	return false;
}