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

for(i=0;i<14;i++){
imgAry[i]=new Image();
}

imgAry[0].src="./images/top_navi_works.gif";
imgAry[1].src="./images/top_navi_works_on.gif";
imgAry[2].src="./images/top_navi_nagare.gif";
imgAry[3].src="./images/top_navi_nagare_on.gif";
imgAry[4].src="./images/top_navi_example.gif";
imgAry[5].src="./images/top_navi_example_on.gif";
imgAry[6].src="./images/top_navi_company.gif";
imgAry[7].src="./images/top_navi_company_on.gif";
imgAry[8].src="./images/top_navi_map.gif";
imgAry[9].src="./images/top_navi_map_on.gif";
imgAry[10].src="./images/top_navi_contact.gif";
imgAry[11].src="./images/top_navi_contact_on.gif";
imgAry[12].src="./images/top_navi_blog.gif";
imgAry[13].src="./images/top_navi_blog_on.gif";
}

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