Simple SQL statement problem

[maximus99999]

$itemnames = "SELECT * FROM inventory INNER JOIN purchases ON inventory.id = purchases.item_id";
$itemnamesres = mysql_query($itemnames);
$useritems = "SELECT * FROM ".$itemnameres." WHERE session='".session_id()."'";
$useritemsres = mysql_query($useritems);
while($itemrow = mysql_fetch_assoc($useritemsres))
{
echo "<div align='center'>".$itemrow['name']."</div>";
}

Does anybody know the reason why this doesn't work?
The problem is when I want to use the result from the first statement.

[bubbisthedog]

Please display the table structures of inventory and purchases.

[maximus99999]

nvm, i got it fixed.

Should've just combined the sql statements instead of using 2 different ones.

[mattyblah]

you're try to use a resource where a string was expected.