function rech() {
	/*
	var left = document.getElementById('left').offsetHeight;
	var content = document.getElementById('content').offsetHeight;
	var doc = document.documentElement.clientHeight;
	var new_left = 0;
	var new_content = 0;
	var min_height = doc-267;
	if (left<min_height){
		new_left = min_height;
	}
	else {
		new_left = left+10;
	}
	
	
	if (content<min_height){
		new_content = min_height;
	}
	else {
		new_content = content+10;
	}
	if (content>left){
		new_left = content+10;
	}
	if (left>content){
		new_content = left+10;
	}

	document.getElementById('left').style.height = new_left+'px';
	document.getElementById('content').style.height = new_content+'px';
	*/
	
	if((document.documentElement.clientHeight-267) > document.getElementById('content').offsetHeight){
		document.getElementById('content').style.height = document.documentElement.clientHeight-267+10+'px';
		var newHeight = document.documentElement.clientHeight-267+10;
	}
	else {
		document.getElementById('content').style.height = document.getElementById('content').offsetHeight+10+'px';
		var newHeight = document.getElementById('content').offsetHeight+10;
	}
	
	var left = document.getElementById('left').offsetHeight;
	var content = document.getElementById('content').offsetHeight;
	
	if(left < content){
		document.getElementById('left').style.height = content+'px';
		if(document.getElementById("werbung")){
			showPopUp(newHeight+267-10);
		}
	}
	
	if(left > content){
		document.getElementById('content').style.height = left+'px';
		if(document.getElementById("werbung")){
			showPopUp(newHeight+267-10);
		}
	}
	
}