// Window höhe ermitteln, für IE und FF getestet
function getWindowHeight(win){
    if (win == undefined) win = window;
    if (win.innerHeight) {
        return win.innerHeight;
    }else{
        if (win.document.documentElement 
                && win.document.documentElement.clientHeight) {
            return win.document.documentElement.clientHeight;
        }
        return win.document.body.offsetHeight;
    }
	return '600';
}