function changeMenu(n)
{
  for (i=1;i<5;i++)
   {  
     if(i==n)
	  {
	    
		document.getElementById("hr"+i+"").className="cug";
		document.getElementById("mlist"+i+"").style.display="";	
	 
		
	  }
	  else
	  {			
	  	document.getElementById("hr"+i+"").className="";
	    document.getElementById("mlist"+i+"").style.display="none";		
		 
	  }      
   }
    
}