Problem typing in PHP forms on Mac OS

Hello all. I have created a few PHP pages on our website where users can go a fill out a simple form and submit it to our support department using the post method. For users on PC's, this works flawlessly. I am getting complaints from people who use Macintosh who say that they are not able to type in certain fields. The fields in question are text boxes. There is not anything special about the code (snippet at the end of this email). They are hitting the issue using Safari, Netscape, or IE and with varying versions of each. Has anyone out there run into this before? Thanks Jeff <form action="go_auto.php" method="post"> <table cellspacing=0 border=0 cellpadding=2 width=350> #condensed# <tr> <td><font size=1 face=arial>Billing Address</td> <td><font size=1 face=arial><input type="text" name="cardaddress" id="cardaddress" size=35></td></tr> #condensed# <input type="radio" name="agreement" value="YES">I agree to the conditions above<br> <input type="radio" name="agreement" value="NOPE">I do not agree with the conditions above<br> </table> <input type="submit" name=submit value="Submit"> </form>