How to set up a bold line in visual basic code for one selected line in chart

Dear people!

I have the following problem.
I have a table with such data for example

STEP VALUE LINE THICKNESS
1 10 bold
2 11 bold
3 12 bold
4 13 bold
5 14 normal
1 20 normal
2 21 normal
3 22 normal
4 23 normal
5 24 normal
1 30 normal
2 31 normal
3 32 normal
4 33 normal
5 34 normal


Could you be so kind and write how to set up a line thickness (bold or
normal) in visual basic code regarding to the value of LINE THICKNESS column
in a table????
I use changable numbers of series (that it lines) in chart. Sometimes it is
2 and the other times is 10 or more and the status of a line (bold or
normal) is also changable.
I use Chart in MS Access 97

Thank you in advance for your help
Regards
Marcin from Poland