jQuery Grid Plugin - jqGrid

Notice: Undefined index: page in C:\wamp\www\nwiseCRM\testGrid.php on line 64

Notice: Undefined index: rows in C:\wamp\www\nwiseCRM\testGrid.php on line 67

Notice: Undefined index: sidx in C:\wamp\www\nwiseCRM\testGrid.php on line 71

Notice: Undefined index: sord in C:\wamp\www\nwiseCRM\testGrid.php on line 74

Notice: Use of undefined constant grid - assumed 'grid' in C:\wamp\www\nwiseCRM\testGrid.php on line 83
Couldn't execute query.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 '' at line 1

Tried to solve this with SQL syntax. 

mysql_select_db(grid, $db) or die("Error connecting to db."); 

$result = mysql_query("SELECT COUNT(*) AS count FROM invheader"); 

$result = mysql_query( $SQL ) or die("Couldn't execute query.".mysql_error());$SQL = "SELECT invid, invdate, amount, tax,total, note FROM invheader ORDER BY $sidx $sord LIMIT $start , $limit"; 

I copied from jqgrid's files but changed name for db,tablename etc.

Without php it works well with jqgrid.

Thanks for help!

// Pilem1969