function changeDisplay(div1,div2){
	 elem1 = document.getElementById(div1);
	 elem2 = document.getElementById(div2);
	 elem1.style.display = "block";
	 elem2.style.display = "none";
}
function menu_kiv(menu_id){
	elem=document.getElementById(menu_id);
	elem.style.color="#ffffff";
	elem.style.background="#739618";
}
function div_nyit_zar(div_id){
	elem=document.getElementById(div_id);
	if((elem.style.display=="block")){
		elem.style.display = "none";
	}else{
		elem.style.display = "block";
	}
}