function addMenu()
{
  
  var i = 1;
  for(i=1; i<14; i++)
  {
     var aux = "nav"+i;
     adding(aux);
        
  } 
  //adding("mesq");
  //adding("mdir");  
}


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"), "");
  		}
	}
	
}



function randBack()
{
  var rand = Math.floor((7-0)*Math.random()) + 1;
  //alert(rand);
  document.getElementById("body").style.backgroundImage = "url(imgs/img"+rand+".jpg)";
}