var imgMap = new Object();

var iTmp = new Image();
iTmp.src = "/img/mainpage_liity_btn_01.gif";
imgMap['mainpage_liity_btn_0'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/mainpage_liity_btn_02.gif";
imgMap['mainpage_liity_btn_1'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/mainpage_liity_btn_03.gif";
imgMap['mainpage_liity_btn_2'] = iTmp;


iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_a_01.gif";
imgMap['annu_kysy_btn_a_0'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_a_02.gif";
imgMap['annu_kysy_btn_a_1'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_a_03.gif";
imgMap['annu_kysy_btn_a_2'] = iTmp;


iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_b_01.gif";
imgMap['annu_kysy_btn_b_0'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_b_02.gif";
imgMap['annu_kysy_btn_b_1'] = iTmp;

iTmp = new Image();
iTmp.src = "/img/annu_kysy_btn_b_03.gif";
imgMap['annu_kysy_btn_b_2'] = iTmp;


function roll_over(img, state) {
  img.src = imgMap[(img.name+"_"+state)].src;
}