window.onload = addBehavior;
var popUpWin=0;

function addBehavior() {
	if (document.getElementById("pferd"))
		var pferd = document.getElementById("pferd");
	if (document.getElementById("photo_gross"))
		var pferd = document.getElementById("photo_gross");
	pferd.firstChild.onclick = popUpWindow;
}

function popUpWindow() {
	if(popUpWin) {
		if(!popUpWin.closed) popUpWin.close();
	}
	var URLStr = this.href;
	var left = 120;
	var top = 120;
	var width = this.firstChild.width / 270 * 600;
	var height = this.firstChild.height / 200 * 444;
	popUpWin = open(URLStr, 'Vorschaufenster', 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbars=auto,resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
	popUpWin.focus;
	if (popUpWin) return false;
}