function ShowField(show){
	for (var i = 0; i < document.getElementsByTagName("SELECT").length; i++)
	{
		document.getElementsByTagName("SELECT")[i].style.visibility = (show?"visible":"hidden");
	}
}

// Menu
activateMenu = function(nav) {
    /* currentStyle restricts the Javascript to IE only */

	if (document.all && document.getElementById(nav).currentStyle) {  
        var navroot = document.getElementById(nav);
        
        /* Get all the list items within the menu */
        var lis=navroot.getElementsByTagName("LI");  
        for (i=0; i<lis.length; i++) {
        
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL"){
            
                /* assign the function to the LI */
             	lis[i].onmouseover=function() {	
                   /* display the inner menu */
                   this.lastChild.style.display="block";
                   ShowField(false);
                }
                
                lis[i].onmouseout=function() {                       
                   this.lastChild.style.display="none";
                   ShowField(true);
                }
            }
        }
    }
}

window.onload = function(){
    /* pass the function the id of the top level UL */
    /* remove one, when only using one menu */
    activateMenu('subProdutos');
    activateMenu('subEmpresa');
	activateMenu('subMarcas');
}