如何调用函数PostgreSQL

-- Function: "saveUser"(integer,character varying,character varying)

-- DROP FUNCTION "saveUser"(integer,character varying);

CREATE OR REPLACE FUNCTION "saveUser"("pUserID" integer,"pName" character varying,"pLastName" character varying,"pUserName" character varying,"pPassword" character varying,"peMail" character varying)
  RETURNS boolean AS
$BODY$
BEGIN
SELECT 1
FROM "USERS"
WHERE "userID" = $1;

IF FOUND THEN
UPDATE "USERS" 
    SET     "name" = $2,"lastName" = $3,"userName" = $4,"password" = $5,"eMail" = $6
WHERE "userID" = $1;
ELSE
    INSERT INTO "USERS"
    ("name","lastName","userName","password","eMail")
    VALUES
        ($2,$3,$4,$5,$6);
END IF;
END;$BODY$
  LANGUAGE 'plpgsql' VOLATILE
  COST 100;
ALTER FUNCTION "saveUser"(integer,character varying) OWNER TO postgres;

PostreSQL文档指出，要调用不返回任何结果集的函数，仅写入其名称和属性就足够了。所以我尝试调用这样的功能：

"saveUser"(3,'asd','asd');

但是我收到以下错误：

ERROR:  syntax error at or near ""saveUser""
LINE 1: "saveUser"(3,'asd')
     ^

********** Error **********

ERROR: syntax error at or near ""saveUser""
SQL state: 42601
Character: 1

我有其他功能返回结果集。我使用SELECT * FROM“fnc”(…)来调用它们，它可以工作。为什么我得到这个错误？

编辑：我正在使用pgAdmin III查询工具，并试图在那里执行SQL语句。