$(document).ready(function(){ 
     

if (document.getElementById("randspalte")) {

       var mainhoehe = document.getElementById("maincontent").offsetHeight - 50;
       var righthoehe = document.getElementById("randspalte").offsetHeight -130;

       if (mainhoehe > righthoehe) {righthoehe = mainhoehe;}
       else {var mainhoehe = righthoehe;}

       $("#maincontent").height(mainhoehe);
       $("#randcont").height(righthoehe);
}

	$("#mainmenu li:not(.active) a").hover(function() {
	  $(this).animate(
			{backgroundPosition:"(0 0)"}, 
			{duration:300})
	}, function() {

                  $(this).animate(
		  {backgroundPosition:"(0 50px)"}, 
		   {duration:0})
	});

  });