Question : Click on an item in a list box and have that value populate a text field

I have a form which contains a list box named "lstSerialNumbers".  When an item in this listbox is clicked on once I want that value to populate into a text box named "txtRemarks".  But if the user clicks on another item in the list box I want that items value to be added to the txtRemarks field.  But I need the items in the txtRemarks field to be separated by a comma - space.  For example...  123, 345, 742.

The items in the listbox are text values as is the field, "txtRemarks".

How can I make this happen?

Answer : Click on an item in a list box and have that value populate a text field

The MS HTML help workshop:
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More info here:
http://msdn.microsoft.com/en-us/library/ms670169%28v=VS.85%29.aspx