help on code

[divided_by_fear]

i was wondering how could i use the default avatar for new users that just signed up with this code... basicly i want the users who already have there avatars to be displayed on mouse over and the ones who have just signed up use a avatar i chose the default avatar... what its going to do is be a mouse over for online users to display there avatars

$stylevar[dirmark]
<a onClick="window.open('sms.php?do=sms&amp;userid=$l oggedin[userid]', '_blank', 'toolbar=no,location=no,menubar=no,width=400,heigh t=400,resizeable=no,status=no' ); return false" target="_blank" title="Send a sms to $loggedin[username] ?" href="sms.php?do=sms&userid=$loggedin[userid]" <if condition="$bbuserinfo['userid']">onmouseover="return escape('<img src=\'image.php?u=$loggedin[userid]&type=avatarurl&dateline=$profilepic[dateline]\' width=\'100\' height=\'100\'>')"></if>$loggedin[musername] </a>$loggedin[invisiblemark]$loggedin[buddymark]</a>