function MenuAmaga(id_Div) {
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		capa.style.visibility="hidden" ;
		capa.style.display="none" ;
	}
}
function MenuMostra(id_Div) {
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		capa.style.visibility="visible" ;
		capa.style.display="inline-block" ;
	}
}
function MenuEsVisible(id_Div) {
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		if (capa.style.visibility=="visible") {
		       	return true;
		} else {
	 		return false;
		}
	}
	return true;
}
function menuHeight(id_Div){
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		//return capa.style.height;
		return capa.scrollHeight;
	}
}
function scrollMenu(id_Div,height){
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		capa.style.marginTop=-height;
	}
}
function scrollMenuPosOriginal(id_Div){
	if (document.getElementById(""+id_Div+"")){
		capa = document.getElementById(""+id_Div+"");
		capa.style.marginTop=0;
	}
}
function addListener(obj,evt,func) {
    	if (obj.attachEvent)
        	obj.attachEvent('on' + evt, func);
    	else {
        	if (obj.addEventListener) {
            		obj.addEventListener(evt,func,false);
        	} else {
            		if (obj.eval) {
                		obj["on"+evt] = func;
            		}		
        	}
    	}
}