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

for(i=0;i<18;i++){
imgAry[i]=new Image();
}

imgAry[0].src="./images/navi-home.gif";
imgAry[1].src="./images/navi-home_over.gif";
imgAry[2].src="./images/navi-problem.gif";
imgAry[3].src="./images/navi-problem_over.gif";
imgAry[4].src="./images/navi-pro1.gif";
imgAry[5].src="./images/navi-pro1_over.gif";
imgAry[6].src="./images/navi-pro2.gif";
imgAry[7].src="./images/navi-pro2_over.gif";
imgAry[8].src="./images/navi-pro3.gif";
imgAry[9].src="./images/navi-pro3_over.gif";
imgAry[10].src="./images/navi-kasou.gif";
imgAry[11].src="./images/navi-kasou_over.gif";
imgAry[12].src="./images/navi-products.gif";
imgAry[13].src="./images/navi-products_over.gif";
imgAry[14].src="./images/navi-company.gif";
imgAry[15].src="./images/navi-company_over.gif";
imgAry[16].src="./images/navi-contact.gif";
imgAry[17].src="./images/navi-contact_over.gif";
}

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