function submenue(div){
	divs=document.getElementsByTagName("div");
	text="";
	for (i=0;i<divs.length;i++){
		if (divs[i].className=="empty"){
			if(divs[i].id==div) divs[i].style.visibility="visible";
			else divs[i].style.visibility="hidden";
		}
	}
}