window.onload = function(){
	var menu_top = document.getElementById("menu_top");
	var buttons = menu_top.getElementsByTagName("a");
	var pathImagen = "images/";
	var imagenExt = ".gif";
	for(i=0;i < buttons.length; i++){
		var buttonID = buttons[i].getAttribute("id");
		buttons[i].onmouseover = function changeImagenOver(){
			this.getElementsByTagName("img")[0].setAttribute("src", pathImagen + this.getAttribute("id")+"_f2" + imagenExt);
		};
		buttons[i].onmouseout = function changeImagenOut(){
			this.getElementsByTagName("img")[0].setAttribute("src", pathImagen + this.getAttribute("id") + imagenExt);
		};
	}

	var menu_left = document.getElementById("b1l_contenedor");
		var categorias = menu_left.getElementsByTagName("li");
	//var pathImagen = "images/";
	//var imagenExt = ".gif";
	for(i=0;i < categorias.length; i++){
		categorias[i].onmouseover = function categoriaOver(){
			this.style.border='none';
			this.getElementsByClassName("nombre_categoria")[0].style.color='#0000FF';
			this.getElementsByClassName("nombre_categoria")[0].style.border='none';
		};
		categorias[i].onmouseout = function categoriaOut(){
			this.getElementsByClassName("nombre_categoria")[0].style.color='#000';
			this.getElementsByClassName("nombre_categoria")[0].style.border='1px solid #000';
		};

	}

}