Connect To Two Databases In One Php Script

Hello!
I have a problem connecting to two mssql databases to select data in one php script.
- I made two different include file to connect to the two db's
- in the php script I include both files
- my first select statement look as follows:

$msquery1 = "SELECT Dateiname FROM database1.dbo.table";
$msquery1 .= "WHERE AuftragNr = '$jobNr'";
$msresult1 = mssql_db_query($msquery1,$link1);
while ($mszeile1=mssql_fetch_array($msresult1))
{
...
echo "<td>$mszeile1[Dateiname]</td>";
...
}
mssql_close ($link1);

- the second select statement in the same file:

$msquery = "SELECT AdrName FROM database2.dbo.table";
$msquery .= "WHERE AuftragNr = '$AuftragNr'";
$msresult = mssql_db_query($msquery,$link);
while ($mszeile=mssql_fetch_array($msresult))
{
...
echo "<td>$mszeile[AdrName]</td>";
...
}
mssql_close ($link);

I am totally stuck - when I take one select out an run the other one separately I get the field contents I ask for.

Can anyone help - I searched this forum and many more but I cannot see where I go the wrong way.

Thanks very much in advance.
Marion