[MarkB]

An addition to this. If for some reason the person deletes the default code without putting in a URL, and their avatar shows as a broken image, you can add this code to get around it:

In admin/functions.php - under:

if ($post[homepage]!="" and $post[homepage]!="http://") {
           eval("\$post[homepage] = \"".gettemplate("postbit_homepage")."\";");
} else {
           $post[homepage]="";
		}

ADD:

if ($post[field#]!="" and $post[field#]!="https://vborg.vbsupport.ru/greentek/clear.gif") {
	eval("\$post[off_avatar] = \"".gettemplate("postbit_off_avatar")."\";");
} else {
	$post[off_avatar]="";
}

(where # is the field number)

Create a new template called postbit_off_avatar using the following:

<img src="$post[field#]" width="$post[width]" height="$post[height]" border="0"><br>

And in your postbit template, where before you had the above code, put simply:

$post[off_avatar]

And you should now have no broken avatar images (unless someone's using Geocities!)