现有名为image1图片，如何通过Button1将图片变大,Button2将图片变小,Button3结束程序？

用什么语言？

private sub Button1_click()
image1.width = image1.width * 2
end sub

private sub Button2_click()
image1.width = image1.width / 2
end sub

private sub Button3_click()
end
end sub

<style>
.divstyle{position:absolute; width="0";height:"0"}
</style>
<script>
<!--
function showimg(form)
{
adres = form.image_file.value;
index = adres.indexOf(".gif");
index = index + adres.indexOf(".jpg");
index = index + adres.indexOf(".bmp");
if (form.image_file.value == "")
{alert("错误，未发现任何图片!");}
else
{if (index == -3){alert("错误的图片格式");
form.width.value=0;
form.height.value=0;}
else
{
var img_obj = new Image();
img_obj = form.image_file.value;
document.changing.src = img_obj;
docume