if (navigator.appVersion > "3") {
    btnImg1o = new Image(); btnImg1o.src = 'img/contact_btn01_o.jpg';
	btnImg1 = new Image(); btnImg1.src = 'img/contact_btn01.jpg';
	btnImg2o = new Image(); btnImg2o.src = 'img/contact_btn02_o.jpg';
	btnImg2 = new Image(); btnImg2.src = 'img/contact_btn02.jpg';
	btnImg3o = new Image(); btnImg3o.src = 'img/contact_btn03_o.jpg';
	btnImg3 = new Image(); btnImg3.src = 'img/contact_btn03.jpg';

}
function imgchange(imgName,imgNum) {
    if (navigator.appVersion > "3") {
        document.images[imgName].src = eval(imgNum + '.src');
    }
}