mysql_free_result return error saying not valid mysql result resource

hi

im trying to do a query which takes rows of large amounts of text data
and displays them one after another. the size of the fields is causing
the page to be massive in size. so to try and reduce this im trying to
use mysql_free_result to clear the contents from memory.

however its returning an error saying not valid mysql data when im
certain that it is.

is this because im using a while loop like this...?

($row = mysql_fetch_result($result)) {
mysql_free_result($result);
}