Convert Month Name, Year Range To Mm/dd/yy

Using SQL 2000. I need to select rows based on a date range. Both the
beginning date and ending date of the range will be entered in the
mm/dd/yy format. There are 2 columns in the table called MonthOfEval
and YearOfEval, both varchar(9) and both with data like "August" and
"2005-2006". I think I need to use these 2 columns to create a date in
the mm/dd/yy format, then use that newly created date to see if it's
within the date range. How would I go about doing this or is there a
better way?

Thanks for any help or advice.