function hover(obj, t){
  if(document.all){
    UL = obj.getElementsByTagName('ul');
    if(UL.length > 0){
      sousMenu = UL[0].style;
      if(sousMenu.display != 'block'){
        sousMenu.display = 'block';
      }else{
        sousMenu.display = 'none';
      }
    }
    if (t=='in' && obj.parentNode.id == 'menu'){
	    LI = document.getElementById('menu').getElementsByTagName('li');
		  nLI = LI.length;
		  for(i=0; i < nLI; i++){
		  	if (LI[i] != obj && LI[i].parentNode.id == 'menu'){
		  			clear(LI[i]);
		  	}
		  }
    }
  }
}

function setHover(){
  LI = document.getElementById('menu').getElementsByTagName('li');
  nLI = LI.length;
  for(i=0; i < nLI; i++){
    LI[i].onmouseover = function(){
      hover(this, 'in');
    }
    LI[i].onmouseout = function(){
      hover(this, 'out');
    }
  }
}

function clear(obj)
{
	UL = obj.getElementsByTagName('ul');
	if(UL.length > 0){
		UL[0].style.display = 'none';
	}
}