window.onload = function() {
  	objekt_hoehe=document.getElementById('tt-content').offsetHeight;
  	left_navigation=document.getElementById('leftNavi').offsetHeight;
  	hoehe = objekt_hoehe - 155 - left_navigation;
  	if(hoehe < 110) {
  		hoehe=110;
  	}
  	document.getElementById("ttNavBorder").style.height=  hoehe + "px";
  	document.getElementById("ttNavBorder").style.backgroundImage= "url(/fileadmin/images/tt_main-nav.jpg)";
	document.getElementById("ttNavBorder").style.backgroundColor = "#f0f4f7";
        if(objekt_hoehe < 490) {
        	document.getElementById("main").style.backgroundColor = "#fff"; 
        	document.getElementById("main").style.backgroundPosition = "0 0";       	
        }
}