HtmlImage1.aspx font size:
<html>
<head>
<title>Changing a Displayed HTMLImage Dynamically</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
void chgImage ( object src, EventArgs e ) {
   Image.Src = "~/shared/images/" + ImgSelector.Value;
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc -->
<div class="header"><h2>Changing a Displayed <span class="hilite">HTMLImage</span> Dynamically</h2></div>
<hr size=1 width=92%>

<div align="center">
<form runat="server">

   <p>Select image file: 
   <select id="ImgSelector" runat="server">
      <option value="Earth.gif">Earth</option>
      <option value="Jupiter.gif">Jupiter</option>
      <option value="Mars.gif">Mars</option>
      <option value="Mercury.gif">Mercury</option>
      <option value="Neptune.gif">Neptune</option>
      <option value="Pluto.gif">Pluto</option>
      <option value="Uranus.gif">Uranus</option>
      <option value="Saturn.gif">Saturn</option>
      <option value="Venus.gif">Venus</option>
   </select>
   <input type=submit runat="server" value="Apply" onServerClick="chgImage">

   <p><img id="Image" runat="server" src="/shared/images/earth.gif" /></p>

</form>
</div>

<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>