<script runat="server">
Sub submit(Source As Object, e As EventArgs)
if red.Checked=True then
p1.InnerHtml="！"
else
p1.InnerHtml="！"
end if
red.checked=false
blue.checked=false
End Sub
</script>
<html>
<body>
<form runat="server">
颜色？
<br />
<input id="red" type="checkbox" runat="server" /> 红色
<br />
<input id="blue" type="checkbox" runat="server" /> 蓝色
<br />
<input type="button" value="提交" OnServerClick="submit" runat="server"/>
<p id="p1" runat="server" />
</form>
</body>
</html>