var img_data = new Array()
for(i=0;i<=30;i++) { img_data[i] = new Image(); }

img_data[0].src = "./img_cmn/navi_about.gif";
img_data[1].src = "./img_cmn/navi_cg.gif";
img_data[2].src = "./img_cmn/navi_photo.gif";
img_data[3].src = "./img_cmn/navi_movie.gif";
img_data[4].src = "./img_cmn/navi_product.gif";
img_data[5].src = "./img_cmn/navi_photoshop.gif";
img_data[6].src = "./img_cmn/navi_material.gif";
img_data[7].src = "./img_cmn/navi_weblog.gif";
img_data[8].src = "./img_cmn/navi_link.gif";
img_data[9].src = "./img_cmn/navi_index.gif";
img_data[10].src = "./img_cmn/navi_mail.gif";

img_data[20].src = "./img_cmn/navi_about2.gif";
img_data[21].src = "./img_cmn/navi_cg2.gif";
img_data[22].src = "./img_cmn/navi_photo2.gif";
img_data[23].src = "./img_cmn/navi_movie2.gif";
img_data[24].src = "./img_cmn/navi_product2.gif";
img_data[25].src = "./img_cmn/navi_photoshop2.gif";
img_data[26].src = "./img_cmn/navi_material2.gif";
img_data[27].src = "./img_cmn/navi_weblog2.gif";
img_data[28].src = "./img_cmn/navi_link2.gif";
img_data[29].src = "./img_cmn/navi_index2.gif";
img_data[30].src = "./img_cmn/navi_mail2.gif";

function ch_img(num,name){
document.images[name].src=img_data[num].src;
return true;
}