Can someone help me out?

I am having a problem getting a sql statement to run. I have this in a table called stat_categories, in a field called sql2 select a.name,a.position,a.team,sum(b.yards) as Results from player a,passing b where a.player_num = b.player_num and a.position = '$pos' and b.year >= '$year' group by a.name order by Results desc limit '$display' when I try to display this I get this error: You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near ''$display'' at line 8 I tried removing the ‘’s but this didn’t help. If I put in the sql instead of the variable, it works fine. What am I doing wrong? Any help would be greatly appreciated. Thanks -Rich