UNIX help please

This is what I have so far...

#!/bin/bash
# Author: Joe
# Date: 5.02.09

echo "Author: Joe"
echo "Date:" `date +%D`
echo
echo "Displaying the content of a file from week 2."
echo
cat /mnt/sdb/week2/joe.3-7
echo

#---------------------------------------------------------

echo
echo "Please enter week number (1, 2 or 3) or q to quit."
read num
echo

while [[ $num != q ]]
      do
            if [ $num -lt 4 ]
            then
                  echo "The files submitted in week $num are:"
                  ls ../week$num/joe*
            else
                  echo "Incorrect week number!"
            fi

while [[ $file != q ]]
      do
            echo
            echo "Enter the file name to view contents or enter q"
            read file
            if [ -f ../week$num/$file ]
            then
                  echo
                  echo "The contents of the file $file are:"
                  cat ../week$num/$file
            else
                  read -p "Incorrect file name! Please select again or enter q."
                  echo
                  file
            fi
      done
echo
echo "Please enter week number (1, 2 or 3) or q to quit."
read num
echo
done

When I enter 4 at the beginning it states wrong week but it still goes into the next while statement.  How do I get it to go back to the beginning till the correct number is entered??

After that it should go into the next while statement and when the name of file is entered it should show the content of file but then id like for it to either give me the option to enter another name or enter another number for week or quit.

Any help would be great!!

Thanks.