function getWindowHeight() {

  var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	}
	else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowHeight = document.documentElement.clientHeight;
		}
		else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
			}
		}
	}
	return windowHeight;
}
function setFooter() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var leftboxHeight = document.getElementById('leftbox').offsetHeight;
      		var textboxHeight = document.getElementById('textbox').offsetHeight;

			var linkeSpalte = document.getElementById('leftbox');
			var rechteSpalte = document.getElementById('textbox');
			if (textboxHeight > 475) {
				linkeSpalte.style.height = (textboxHeight + 2) + 'px';
 				// rechteSpalte.style.height = (windowHeight - headerHeight) + 'px';       
			}
      else
      {
      	linkeSpalte.style.height = (475) + 'px';
		rechteSpalte.style.height = (458) + 'px';
		//mittlereSpalte.style.height = (contentHeight - headerHeight) + 'px';    
      }
		}
	}
}
window.onload = function() {
	setFooter();
}
window.onresize = function() {
	setFooter();
}