//Klassenname fuer grosse Ansicht
class_big = 'gross';

function zoom(obj) {

	if (!document.getElementById) {
		//kein DOM
		return true;
	} else {
		//DOM

		//Eltern div finden
		while(obj.parentNode.nodeName != "DIV") {
			obj = obj.parentNode;
		}

		var divobj = obj.parentNode;

		//Klasse zuweisen
		if (hasClass(divobj, class_big))
			divobj.className = divobj.className.substr(0,divobj.className.length - (class_big.length + 1));
		else
			divobj.className += ' ' + class_big;

		return false;
	}
}