one mp for several members

[patoche17]

hello

I'm trying to find a solution for sending one mp atsevral members with a button

I'm using this function
<a href="private.php?{vb:raw session.sessionurl}do=newpm&u=338"
where u=338 is the id user for one member.

Ican't add several members as

<a href="private.php?{vb:raw session.sessionurl}do=newpm&u=338&u=7&u=8"
in this case, only the last U is available....aargghh

do you know why and what is the key??

thanks a lot