function verifica_form(){
	form = document.acessa;
	
	if (form.site[0].checked==0 && form.site[1].checked==0){
		alert("Por favor, informe o acesso!");
		form.acessa[0].focus();
		return false;
		}
	
	if (form.usuario.value==""){
		alert("Por favor, informe o login!");
		form.usuario.focus();
		return false;
		}
		
	if (form.senha.value==""){
		alert("Por favor, informe a senha!");
		form.senha.focus();
		return false;
		}	
		
	form.submit();	
}

function limpar_txt(objname){
	document.getElementById(objname).value="";		
	}
	
function horizontal() {
 
   var navItems = document.getElementById("menu_dropdown").getElementsByTagName("li");
    
   for (var i=0; i< navItems.length; i++) {
      if(navItems[i].className == "submenu")
      {
         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";}
         }
      }
   }
 
}