Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource

[lavender]

I GET THIS ERROR:
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/megadver/auto-rank/include_categories.php on line 547

$rs_query=mysql_query("Select * from sbreciprocal_cats where id=" . $cid );
if ($rs=mysql_fetch_array($rs_query))
line 547 --> {
$catname=$rs["catname"];
$category=$rs["id"];
$cid=$rs["id"];
}
else
{
$catname="";
$category=0;
$cid=0;
}
$catpath="";

[abduraooft]

See http://www.google.co.in/search?q=site%3Acodingforums.com%2Fshowthread.php%3Ft%3D+Warning%3A+mysql_fetch_array%28%29%3A+suppl ied+argument+is+not+a+valid+MySQL+result