Browser issue with form submit

[eluser]bhakti.thakkar[/eluser]
hi all,
i have made a form and it works fine in IE. but the submit fails in opera / firefox. below is my code. it doesn't give me any error. The submit button gets clicked but doesnt do any thing (doesn't invoke the method in the controller)

below is my code. what should be modified?

Code:

<?
$attributes = array('id' => 'mainform' , 'name' => 'mainform');
echo form_open('clientprofile/saveContactDetails/' , $attributes); ?>
<input type="hidden" name="Contact_ID" value="<?=$querycontacts->Contact_ID?>">
        <tr>
            <td class="tdheader">Name </td>
            <td class="datatd">&lt;?=$this->site_sentry->GetContactName($querycontacts->Contact_ID)?&gt;</td>
        </tr>

        <tr>
            <td class="tdheader">Telephone </td>
            <td class="datatd">&lt;input type="text" class="txtbox" name="Telephone_VC" value="&lt;?=$querycontacts-&gt;Telephone_VC?&gt;"> Short &lt;input type="text" class="smtxtbox" name="TelephoneShort_VC" value="&lt;?=$querycontacts-&gt;TelephoneShort_VC?&gt;"> </td>
        </tr>
            <tr>
            <td class="tdheader">Fax</td>
            <td class="datatd">&lt;input type="text" class="txtbox" name="Fax_VC" value="&lt;?=$querycontacts-&gt;Fax_VC?&gt;"></td>
        </tr>
        <tr>
            <td class="tdheader">Mobile</td>
            <td class="datatd">&lt;input type="text" class="txtbox" name="Mobile_VC" value="&lt;?=$querycontacts-&gt;Mobile_VC?&gt;"> Short &lt;input type="text" class="smtxtbox" name="MobileShort_VC" value="&lt;?=$querycontacts-&gt;MobileShort_VC?&gt;"> </td>
        </tr>
        <tr>
            <td class="tdheader">E-mail</td>
            <td class="datatd">&lt;input type="text" class="txtbox" name="EMail_VC" value="&lt;?=$querycontacts-&gt;EMail_VC?&gt;"></td>
        </tr>
        <tr>
            <td colspan=2> &lt;input type="submit" name="save" value="Save" style="cursor:hand"&gt;
            &nbsp;&lt;input type="button" value="Cancel" style="cursor:hand" name="Cancel"&gt;    
        </tr>
&lt;/form&gt;

Please help
Thanks