<script runat="server">
Sub choose_image(Sender As Object, e As EventArgs)
image1.Src = select1.Value
End Sub
</script>
<html>
<body>
<form runat="server">
<select id="select1" runat="server">
<option value="/i/eg_smile.gif">笑脸</option>
<option value="/i/eg_bulbon.gif">灯泡</option>
<option value="/i/eg_mouse.jpg">鼠标</option>
</select>
<input type="submit" runat="server" value="显示图像"
OnServerClick="choose_image">
<br /><br />
<img id="image1" src="/i/eg_smile.gif" runat="server" />
</form>
</body>
</html>