imgsrc = new Array();
imgsrc[0] = "/img/common/gnavi_home.gif";
imgsrc[1] = "/img/common/gnavi_home_u.gif";
imgsrc[2] = "/img/common/gnavi_about.gif";
imgsrc[3] = "/img/common/gnavi_about_u.gif";
imgsrc[4] = "/img/common/gnavi_learn.gif";
imgsrc[5] = "/img/common/gnavi_learn_u.gif";
imgsrc[6] = "/img/common/gnavi_attract.gif";
imgsrc[7] = "/img/common/gnavi_attract_u.gif";
imgsrc[8] = "/img/common/gnavi_worldheritage.gif";
imgsrc[9] = "/img/common/gnavi_worldheritage_u.gif";
imgsrc[10] = "/img/common/gnavi_modle.gif";
imgsrc[11] = "/img/common/gnavi_modle_u.gif";
imgsrc[12] = "/img/common/gnavi_report.gif";
imgsrc[13] = "/img/common/gnavi_report_u.gif";
imgsrc[14] = "/img/common/gnavi_kentei.gif";
imgsrc[15] = "/img/common/gnavi_kentei_u.gif";
imgsrc[16] = "/img/common/gnavi_news.gif";
imgsrc[17] = "/img/common/gnavi_news_u.gif";

img = new Array();

for(i=0; i<imgsrc.length; i++){
img[i] = new Image();
img[i].src = imgsrc[i];
}
function highlight(num,imgname){
document.images[imgname].src = img[num].src;
}