var ph_navi_img = new Array()
for(i=0;i<=17;i++) { ph_navi_img[i] = new Image(); }

ph_navi_img[0].src = "./img_cmn/ph_navi_1.gif";
ph_navi_img[1].src = "./img_cmn/ph_navi_2.gif";
ph_navi_img[2].src = "./img_cmn/ph_navi_3.gif";
ph_navi_img[3].src = "./img_cmn/ph_navi_4.gif";
ph_navi_img[4].src = "./img_cmn/ph_navi_5.gif";
ph_navi_img[5].src = "./img_cmn/ph_navi_6.gif";
ph_navi_img[6].src = "./img_cmn/ph_navi_7.gif";
ph_navi_img[7].src = "./img_cmn/ph_navi_8.gif";
ph_navi_img[10].src = "./img_cmn/ph_navi_1b.gif";
ph_navi_img[11].src = "./img_cmn/ph_navi_2b.gif";
ph_navi_img[12].src = "./img_cmn/ph_navi_3b.gif";
ph_navi_img[13].src = "./img_cmn/ph_navi_4b.gif";
ph_navi_img[14].src = "./img_cmn/ph_navi_5b.gif";
ph_navi_img[15].src = "./img_cmn/ph_navi_6b.gif";
ph_navi_img[16].src = "./img_cmn/ph_navi_7b.gif";
ph_navi_img[17].src = "./img_cmn/ph_navi_8b.gif";

function ch_ph_navi(ph_num,ph_name){
document.images[ph_name].src=ph_navi_img[ph_num].src;
return true;
}