function sizeDivs(){
	document.getElementsByTagName('body')[0].style.overflow = 'hidden';
	document.getElementsByTagName('html')[0].style.overflow = 'hidden';
	var contentH;
	if (self.innerHeight){ // alle außer Explorer
		contentH = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight){ // Explorer 6 Strict Mode
		contentH = document.documentElement.clientHeight;
	}
	else if (document.body){ // andere Explorer
		contentH = document.body.clientHeight;
	}
	//var contentH = document.getElementById('wrap1').offsetHeight;
	var headerH = document.getElementById('header').offsetHeight;
	var naviH = document.getElementById('navi').offsetHeight;
	//alert('naviH: '+naviH+'   headerH: '+headerH+'    contentH'+contentH);
	var content2H = contentH-headerH-naviH;
	//alert('contentheight: '+content2H);
	document.getElementById('content').style.height = content2H+'px';
	document.getElementById('content').style.overflow = 'auto';
	//alert('height: '+document.getElementById('content').offsetHeight);
}