function addMenu()
{
  var i = 1;
  for(i=1; i<8; i++)
  {
    var aux = "nav"+i;
    adding(aux);    
  }  
}


function adding(menu) 
{
	var elems = document.getElementById(menu).getElementsByTagName("LI");
	
  for (var i=0; i<elems.length; i++) 
  {
  		elems[i].onmouseover=function() {
  			this.className+=" over";
  		}
  		elems[i].onmouseout=function() {
  			this.className=this.className.replace(new RegExp(" over\\b"), "");
  		}
	}
}