Create A Forum - Support Forums

The login form in html is
        <form action="http://url.createaforum.com/index.php?action=login2" name="frmLogin" id="frmLogin" method="post" accept-charset="ISO-8859-1" onsubmit="hashLoginPassword(this, \'7fc773f3c5525a9e83f5240bb0cae348\');">
        <div class="tborder login">
            <div class="cat_bar">
                <h3 class="catbg">
                    <span class="ie6_header floatleft"><img src="http://images.smfboards.com/caf/images/icons/login_sm.gif" alt="" class="icon"> Login</span>
                </h3>
            </div>
            <span class="upperframe"><span></span></span>
            <div class="roundframe"><br class="clear">
                <dl>
                    <dt>Username:</dt>
                    <dd><input type="text" name="user" size="20" value="" class="input_text"></dd>
                    <dt>Password:</dt>
                    <dd><input type="password" name="passwrd" value="" size="20" class="input_password"></dd>
                </dl>
                <dl>
                    <dt>Minutes to stay logged in:</dt>
                    <dd><input type="text" name="cookielength" size="4" maxlength="4" value="120" class="input_text"></dd>
                    <dt>Always stay logged in:</dt>
                    <dd><input type="checkbox" name="cookieneverexp" class="input_check" onclick="this.form.cookielength.disabled = this.checked;"></dd>
                </dl>
                <p><input type="submit" value="Login" class="button_submit"></p>
                <p class="smalltext"><a href="http://url.createaforum.com/index.php?action=reminder">Forgot your password?</a></p>
                <input type="hidden" name="hash_passwrd" value="">
            </div>
            <span class="lowerframe"><span></span></span>
        </div></form>
        <script type="text/javascript"><!-- // --><![CDATA[
            document.forms.frmLogin.user.focus();
        // ]]></script>
Replace url.createaforum.com with your forum's to get your forum's html login form

I have no idea how to merge them, but I know that MediaWiki has an extension that merges logins with a Simple Machines Forum (aka SMF)