function newImage(arg) {

	if (document.images) {

		rslt = new Image();

		rslt.src = arg;

		return rslt;

	}

}



function changeImages() {

	if (document.images && (preloadFlag == true)) {

		for (var i=0; i<changeImages.arguments.length; i+=2) {

			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];

		}

	}

}



var preloadFlag = false;

function preloadImages() {

	if (document.images) {

		rmenu01init = newImage("/top2005/header_01.gif");

		rmenu01over = newImage("/top2005/header_01_on.gif");

		rmenu02init = newImage("/top2005/header_02.gif");

		rmenu02over = newImage("/top2005/header_02_on.gif");

		rmenu03init = newImage("/top2005/header_03.gif");

		rmenu03over = newImage("/top2005/header_03_on.gif");

		rmenu04init = newImage("/top2005/header_04.gif");

		rmenu04over = newImage("/top2005/header_04_on.gif");



		window.status = "画像の入力が完了しました。";

		preloadFlag = true;

	}

}



var old_tab = 0;

var timerID = 0;

var items = 4;

var tab0 = new Array(items);

var tab1 = new Array(items);



for ( i=0; i<items; i++ )

{

	n = '000'.concat(i+2);

	tab0[i] = new Image();

	tab0[i].src = ("/top2005/header_0"+(n-1)+'.gif');

	tab1[i] = new Image();

	tab1[i].src = ("/top2005/header_0"+(n-1)+'_on.gif');

}

	tab0[4] = new Image();

	tab0[4].src = ('/swf/start.jpg');

	tab1[4] = new Image();

	tab1[4].src = ('/swf/start.jpg');





function menu_ctl(img_no,flag)

{

	menu_no = '000'.concat(img_no);

	menu_no = 'menu'+menu_no.substring(menu_no.length-2, menu_no.length);

	tab_img = 'tab'+menu_no.substring(menu_no.length-2, menu_no.length);



	if ( flag == 0 )

		document[tab_img].src = tab0[img_no-1].src;

	if ( flag == 1 )

		document[tab_img].src = tab1[img_no-1].src;







	if ( flag == 0 ) type = 'hidden';

	else type = 'visible';



	if ( document.layers ) // for NN4

		document.layers[menu_no].visibility = type;

	else if ( document.all ) // for IE

		document.all(menu_no).style.visibility = type;

	else if ( document.getElementById ) // for NN6

		document.getElementById(menu_no).style.visibility = type;



	return true;

}





function show(img_no,flag)

{

    if (document.images && (preloadFlag == true)) {

	if ( flag == 0 )

	{

		if ( timerID != 0 )

		{

			clearTimeout(timerID);

			timerID = 0;

			old_tab = 0;

			menu_ctl(img_no,0);

		}

		else

		{

			old_tab = img_no;

			var cmd = 'show('+img_no+',0)';

			timerID = setTimeout(cmd,100);

		}

	}

	else if ( flag == 1 )

	{

		if ( (timerID != 0) && (old_tab == img_no) )

		{

			clearTimeout(timerID);

			timerID = 0;

		}

		for ( i=1; i<=items; i++ )

		{

			if ( i == img_no )

				menu_ctl(i,1);

			else

				menu_ctl(i,0);

		}

	}



    }

	return true;

}