function topnewsChange(tabNum){

	for (i=0;i<=3;i++){
		document.getElementById("topnewsItem" + i).style.display="none";
		document.getElementById("topnewsTab" + i).style.backgroundImage="url('/base/images/topnews_button_off.gif')";

	}

	document.getElementById("topnewsItem" + tabNum).style.display="block";
	document.getElementById("topnewsTab" + tabNum).style.backgroundImage="url('/base/images/topnews_button_on.gif')";
}

function naviMainChange(naviNum){

	for (i=0;i<=10;i++){
		document.getElementById("naviSub" + i).style.display="none";

	}

	document.getElementById("naviSub" + naviNum).style.display="block";
}