Incase anyone want a login box on the popup for existing members so it doesn't become annoying for members who simply are not logged in... u may use my form which i slightly edited...
forumhome_vbpopup
Code:
<div id="vbpopup" style="visibility:hidden">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="400" align="center">
<td align="center" valign="middle" class="alt2">
<!-- Start Announcement Message -->
<p style="margin-top: 0; margin-bottom: 0"><b>Please take some time
to register at our forum</b></p>
<p style="margin-top: 0; margin-bottom: 0"><b>Takes less them a
minute...</b></p>
<p style="margin-top: 0; margin-bottom: 0"> </p>
<p style="margin-top: 0; margin-bottom: 0"><b>This pop up does not
show for members logged in!<br><br>
Click <a href="register.php?$session[sessionurl]">here</a> to
<a href="register.php?$session[sessionurl]">$vbphrase[register]</a></b></p>
<p style="margin-top: 0; margin-bottom: 0"> </p>
<p style="margin-top: 0; margin-bottom: 0"><b>or if you are a member
already, login below...</b></p>
<p style="margin-top: 0; margin-bottom: 0"> </p>
<p style="margin-top: 0; margin-bottom: 0"> <!-- login form -->
<form action="login.php" method="post" onsubmit="md5hash(vb_login_password,vb_login_md5password,vb_login_md5password_utf)">
<script type="text/javascript" src="clientscript/vbulletin_md5.js"></script>
<table cellpadding="0" cellspacing="$stylevar[formspacer]" border="0">
<tr>
<td class="smallfont">$vbphrase[username]</td>
<td><input type="text" class="button" name="vb_login_username" id="navbar_username" size="10" accesskey="u" tabindex="1" value="$vbphrase[username]" onfocus="if (this.value == '$vbphrase[username]') this.value = '';" /></td>
<td class="smallfont" colspan="2" nowrap="nowrap"><label for="cb_cookieuser_navbar"><input type="checkbox" name="cookieuser" value="1" tabindex="3" id="cb_cookieuser_navbar" accesskey="c" checked="checked" />$vbphrase[remember_me]</label></td>
</tr>
<tr>
<td class="smallfont">$vbphrase[password]</td>
<td><input type="password" class="button" name="vb_login_password" size="10" accesskey="p" tabindex="2" /></td>
<td><input type="submit" class="button" value="$vbphrase[log_in]" tabindex="4" title="$vbphrase[enter_username_to_login_or_register]" accesskey="s" /></td>
</tr>
</table>
<input type="hidden" name="s" value="$session[sessionhash]" />
<input type="hidden" name="do" value="login" />
<input type="hidden" name="forceredirect" value="1" />
<input type="hidden" name="vb_login_md5password" />
<input type="hidden" name="vb_login_md5password_utf" />
</form>
<!-- / login form --></p>
<p style="margin-top: 0; margin-bottom: 0"> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font class="smallfont">(This window will self close shortly)</font></td>
</tr>
</table>
</div>