if(navigator.appVersion.charAt(0)>=3){
var imgAry=new Array();

for(i=0;i<28;i++){
imgAry[i]=new Image();
}

imgAry[0].src="/images/navi_home.gif";
imgAry[1].src="/images/navi_home_on.gif";
imgAry[2].src="/images/navi_shikkoubu.gif";
imgAry[3].src="/images/navi_shikkoubu_on.gif";
imgAry[4].src="/images/navi_board.gif";
imgAry[5].src="/images/navi_board_on.gif";
imgAry[6].src="/images/navi_kaihoushi.gif";
imgAry[7].src="/images/navi_kaihoushi_on.gif";
imgAry[8].src="/images/navi_schedule.gif";
imgAry[9].src="/images/navi_schedule_on.gif";
imgAry[10].src="/images/navi_obog.gif";
imgAry[11].src="/images/navi_obog_on.gif";
imgAry[12].src="/images/navi_now.gif";
imgAry[13].src="/images/navi_now_on.gif";
imgAry[14].src="/images/navi_koucho.gif";
imgAry[15].src="/images/navi_koucho_on.gif";
imgAry[16].src="/images/navi_alumni.gif";
imgAry[17].src="/images/navi_alumni_on.gif";
imgAry[18].src="/images/navi_meibo.gif";
imgAry[19].src="/images/navi_meibo_on.gif";
imgAry[20].src="/images/navi_contact.gif";
imgAry[21].src="/images/navi_contact_on.gif";
imgAry[22].src="/images/navi_blog.gif";
imgAry[23].src="/images/navi_blog_on.gif";
imgAry[24].src="/images/navi_regulations.gif";
imgAry[25].src="/images/navi_regulations_on.gif";
imgAry[26].src="/images/navi_party.gif";
imgAry[27].src="/images/navi_party_on.gif";
}

function changeImg(dim,cnt){
if(navigator.appVersion.charAt(0)>=3){
document.images[dim].src=imgAry[cnt].src;
};
};