function desabilita_all(){
	
	var vetor_div = new Array();
	vetor_div[1] = "fotos";
	vetor_div[2] = "videos";
	vetor_div[3] = "noticias";
	vetor_div[4] = "blog";
	for (i=1;i<=4;i++){
	 document.getElementById(vetor_div[i]).style.display="none";
	}
	

}


function horizontal() {


 
   var navItems = document.getElementById("menu_dropdown").getElementsByTagName("li");
    
	valor=0;
	
   for (var i=0; i< navItems.length; i++) {
      if(navItems[i].className == "submenu")
      {
         if(navItems[i].getElementsByTagName('ul')[0] != null)
         {
            navItems[i].onclick=function() {

				    teste=this.getElementsByTagName('ul')[0].style.display;
					if((teste=="")||(teste==" ")||(teste=="none")){
						desabilita_all();
					 	this.getElementsByTagName('ul')[0].style.display="block";
						
						
					 }
					 if(teste=="block"){
					 	this.getElementsByTagName('ul')[0].style.display="none";
						
					 }	 

			}

         }
      }
   }
 
}