$(document).ready(function(){  
  
   //begin with everything closed
  $("ul.level1").hide(); 

  $("ul#mainnav>li").hover(function(){
	    //stop partial animations
		//$("ul.level1").stop(true,true);
		$('ul:first',this).slideDown(200);
    
    }, function(){
		//stop partial animations
		$("ul.level1").stop(true,true);
		//$('ul:first',this).hide();
		$('ul:first',this).slideUp(150);
    });
  
});