change:
<input name="UserPhone" type="text" class="WAATKTextField" id="UserPhone" onBlur="if (document.getElementById('PhoneServerValidation')) document.getElementById('PhoneServerValidation').s tyle.display='none';WAValidatePN(document.getEleme ntById('WAATKRegistrationForm').UserEmail,'- Invalid phone number',false,true,'(xxxxx) xxxxxx',document.getElementById('WAATKRegistration Form').UserEmail,0,true)" value="<?php echo(ValidatedField("usersRegistration","UserPhone ")) ?>" size="32" />
to:
<input name="UserPhone" type="text" class="WAATKTextField" id="UserPhone" onBlur="if (document.getElementById('PhoneServerValidation')) document.getElementById('PhoneServerValidation').s tyle.display='none';WAValidatePN(document.getEleme ntById('WAATKRegistrationForm').UserEmail,'- Invalid phone number',false,true,'',document.getElementById('WAATKRegistration Form').UserEmail,0,true)" value="<?php echo(ValidatedField("usersRegistration","UserPhone ")) ?>" size="32" />