[xman_79]

My solution is :
Replace in pm_messagelistbit template :

PHP Code:

    <if condition="$show['pmicons']"><td class="alt2"><if condition="$show['pmicon']"><img src="$pm[iconpath]" alt="$pm[icontitle]" /><else />&nbsp;</if></td></if> 


with

PHP Code:

<if condition="$sk_avurl"><td class="alt2" width="80"><img src="$sk_avurl[0]" width="80" /></td><else /><td class="alt2" width="80"><img src="images/no_avatar.jpg" width="80" border="0" /></if></td></if> 


Create a image :
Width 80 and height 80
name : no_avatar.jpg
location : vb/images

and result :