function set_mt () {
	var mH=0;
	if (window.innerHeight) {
		mH=window.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		mH=document.documentElement.clientHeight;
	} else if (document.body && document.body.clientHeight) {
		mH=document.body.clientHeight;
	} else {
		mH=0;
	}
	if (mH != 0 && mH<700) {
		document.getElementById("alles").style.marginTop="0px";
	}
}