if(window.addEventListener){
	window.addEventListener("load", menuHome, true);
} else if (window.attachEvent){
	window.attachEvent("on"+"load", menuHome); 
} 

function menuHome() {
  var oMenu = document.getElementById('recurso');
  var aLi = oMenu.getElementsByTagName('li');
  for (var i=0;i<aLi.length;++i) {
    aLi[i].onmouseover = desplegarImg;
    aLi[i].onmouseout = ocultarImg;
  }
}


function desplegarImg() {
      this.className += " estilohover";
}


function ocultarImg(){
      this.className = this.className.replace(" estilohover", "");
}