function on(obj, obj2)
{
	var obj, obj2;
	
	this.obj = document.getElementById(obj);
	this.obj2 = document.getElementById(obj2);
	
	this.obj.style.color = '#333';
	this.obj2.style.display = 'block';
	
}

function off(obj, obj2)
{
	var obj, obj2;
	
	this.obj = document.getElementById(obj);
	this.obj2 = document.getElementById(obj2);
	
	this.obj.style.color = '#FFF';
	this.obj2.style.display = 'none';
	
}


function horizontal() {
 
   var navItems = document.getElementById("menu-principal").getElementsByTagName("li");
   
    
   for (var i=0; i< navItems.length; i++) {
          if(navItems[i].getElementsByTagName('ul')[0] != null)
         {
            navItems[i].onmouseover=function() { this.getElementsByTagName('ul')[0].style.display="block"; }
            navItems[i].onmouseout=function() {this.getElementsByTagName('ul')[0].style.display="none"; }
         }
   }
 
}