change the password field:
<input id="Log_In_group_2_userpass" name="Log_In_group_2_userpass" type="password" value="" class="formPasswordfield_Medium" tabindex="2" title="Please enter a value." confirm="Log_In_group_username" required>
remove the confirm="Log_In_group_username" attribute:
<input id="Log_In_group_2_userpass" name="Log_In_group_2_userpass" type="password" value="" class="formPasswordfield_Medium" tabindex="2" title="Please enter a value." required>