var img_dir = "ths/images/";

var ddata1,ddata2 ,ddata3;



function cchange( ddata1 , ddata2 ){

	if( ddata2 ==  "on" ){

	ddata3 = img_dir + ddata1 + "_on.gif";

		document.images[ddata1].src = ddata3;

	}

	else{

		document.images[ddata1].src = img_dir + ddata1 + ".gif";

	}

}



function preimg(){

var loadcomp = false;

	var preload = new Array();

	for(i = 0 ; i < preloadlist.length ; i++) {

		preload[i] = new Image();

		preload[i].src = preloadlist[i];

	}

	loadcomp = true;

}



var preloadlist = new Array

	(

	'ths/images/menu01.gif',

	'ths/images/menu01_on.gif',

	'ths/images/menu02.gif',

	'ths/images/menu02_on.gif',

	'ths/images/menu03.gif',

	'ths/images/menu03_on.gif',

	'ths/images/menu04.gif',

	'ths/images/menu04_on.gif',

	'ths/images/menu05.gif',

	'ths/images/menu05_on.gif',

	'ths/images/menu06.gif',

	'ths/images/menu06_on.gif',

	'ths/images/menu07.gif',

	'ths/images/menu07_on.gif',

	'ths/images/menu08.gif',

	'ths/images/menu08_on.gif',

	'ths/images/menu09.gif',

	'ths/images/menu09_on.gif',

	'ths/images/menu10.gif',

	'ths/images/menu10_on.gif',

	'ths/images/menu11.gif',

	'ths/images/menu11_on.gif'

	);

preimg();