Changing this code..

I was wondering if anyone could edit this code so they can choose which images appear as the 'x' and 'o' on the game. Not to change the images to something, but to have a selection of more than 2 images which they choose from before starting the game - if that makes any sense. Thanks if anyone can help.

head:

<HEAD>
<SCRIPT LANGUAGE="JavaScript">




</script>
</HEAD>

body:

<BODY>
<center>
<form name=game>
<table border=0>
<td>
<table border=1>
<tr>
<td><a href="javascript:yourChoice('A')"><img src="blank.jpg" border=0 height=100 width=100 name=A alt="Top-Left"></a></td>
<td><a href="javascript:yourChoice('B')"><img src="blank.jpg" border=0 height=100 width=100 name=B alt="Top-Center"></a></td>
<td><a href="javascript:yourChoice('C')"><img src="blank.jpg" border=0 height=100 width=100 name=C alt="Top-Right"></a></td>
</tr>
<tr>
<td><a href="javascript:yourChoice('D')"><img src="blank.jpg" border=0 height=100 width=100 name=D alt="Middle-Left"></a></td>
<td><a href="javascript:yourChoice('E')"><img src="blank.jpg" border=0 height=100 width=100 name=E alt="Middle-Center"></a></td>
<td><a href="javascript:yourChoice('F')"><img src="blank.jpg" border=0 height=100 width=100 name=F alt="Middle-Right"></a></td>
</tr>
<tr>
<td><a href="javascript:yourChoice('G')"><img src="blank.jpg" border=0 height=100 width=100 name=G alt="Bottom-Left"></a></td>
<td><a href="javascript:yourChoice('H')"><img src="blank.jpg" border=0 height=100 width=100 name=H alt="Bottom-Center"></a></td>
<td><a href="javascript:yourChoice('I')"><img src="blank.jpg" border=0 height=100 width=100 name=I alt="Bottom-Right"></a></td>
</tr>
</table>
</td>
<td>
<table>
<tr><td><input type=text size=5 name=you></td><td>You</td></tr>
<tr><td><input type=text size=5 name=computer></td><td>Computer</td></tr>
<tr><td><input type=text size=5 name=ties></td><td>Ties</td></tr>
</table>
</td>
</table>
<input type=button value="Play Again" onClick="playAgain();">

<input type=button value="Game Help" onClick="help();">
</form>
</center>
<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>