function getBrowserHeight() {
	if(navigator.userAgent.indexOf('MSIE') > -1){
		return document.documentElement.clientHeight;
	}
	else {
	//if(navigator.userAgent.indexOf('Gecko') > -1){
		return window.innerHeight;
	}
}

function setContainerHeight() {
	buehneY = getBrowserHeight()
	headerHeight = document.getElementById("header").offsetHeight+document.getElementById("navi-wrapper").offsetHeight;

	// Prüfen ob Content ggf länger
	if(buehneY < document.getElementById("content-middle").offsetHeight+headerHeight) {
		buehneY = document.getElementById("content-middle").offsetHeight+headerHeight;
	}
	if(buehneY < document.getElementById("content-left").offsetHeight+headerHeight) {
		buehneY = document.getElementById("content-left").offsetHeight+headerHeight;
	}
	if(buehneY < document.getElementById("content-right").offsetHeight+headerHeight) {
		buehneY = document.getElementById("content-right").offsetHeight+headerHeight;
	}
	
	leftHeight = document.getElementById("content-left").offsetHeight;

	if((leftHeight+headerHeight)<buehneY) {
		document.getElementById("content-left").style.height=(buehneY-headerHeight)+"px";
	}

	rightHeight = document.getElementById("content-right").offsetHeight;

	if((rightHeight+headerHeight)<buehneY) {
		document.getElementById("content-right").style.height=(buehneY-headerHeight)+"px";
	}
}
setContainerHeight();

window.onresize = setContainerHeight;