Hover button won't always display using Netscape

[Don]

I have a client page that employs hover buttons. They work just fine in IE. But, when using
Netscape, they intermittently won't display. When they don't display, all that shows is a gray box
the normal size of the button, with a red "x" inside the box at the left. Any idea what's going on
here?

Here's the code for one of the hover buttons:
------------------
<font face="verdana, arial" size="1">&nbsp;&nbsp;&nbsp;</font></td>
<font face="verdana, arial" size="2">
<td width="16%">
<p align="center">
<applet code="fphover.class" codebase="./" width="70" height="24">
<param name="color" value="#000080">
<param name="hovercolor" value="#0000FF">
<param name="textcolor" value="#FFFFFF">
<param name="text" value="About">
<param name="effect" value="glow">
<param name="font" value="Dialog">
<param name="fontstyle" value="regular">
<param name="fontsize" value="14">
<param name="url" valuetype="ref" value="about.htm">
<param name="target" value="_top">
</applet>
</font>
-------------------

Thanks,
Don
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