why wont this work!!

[Barry O' Neill]

Hey guys,
I have this procedure written to trim all rows in a given table. But it wil not work it keeps trying to find a table name equal to the variable name rather than a table name equal to the value of the variable. Any help is appreciated. I understand that a table name cannot be dynamic in a cursor definition but in this case the table name is already specified and the parameter is in the where clause. Why wont this work.

DELIMITER $$

DROP PROCEDURE IF EXISTS `barry`.`trimAllCols`$$

CREATE PROCEDURE `trimAllCols`(IN tableName VARCHAR(255))
BEGIN
DECLARE no_more_records INT DEFAULT 0;
DECLARE col_name VARCHAR(255);
DECLARE col_cursor CURSOR FOR
SELECT column_name FROM information_schema.columns WHERE table_name = tableName;
DECLARE CONTINUE HANDLER FOR NOT FOUND
SET no_more_records = 1;

OPEN col_cursor;
FETCH col_cursor INTO col_name;
REPEAT

UPDATE tableName SET col_name = TRIM(col_name);

FETCH col_cursor INTO col_name;
UNTIL no_more_records = 1
END REPEAT;
CLOSE col_cursor;
END$$

DELIMITER ;
*******************************************

CALL trimAllCols('testtable');

gives the following error
Error Code : 1146
Table 'barry.tablename' doesn't exist