Select and OK Paragraph Style

The function myGetParagraphStyleNames is only for the purpose of the dialog box so the user can choose the style she wants to use for the labels.

It sounds as if you want to use a specific paragraph style without having to choose it in the dialog. You can tell the dialog to choose a specific style as the default. You do this by setting the value of selectedIndex (which is currently set to 0--the first item in the list).

   var myLabelStyleDropdown = dropdowns.add({stringList:myStyleNames, selectedIndex:0});

For example, if you want the paragraph style  to be "Normal" and it is always the fourth one in the list, you could change the line to read:

   var myLabelStyleDropdown = dropdowns.add({stringList:myStyleNames, selectedIndex:3});

The problem is that, depending on the document, the list of paragraph styles will change ("Normal" will not always be the third one in the list).

You can be sure that the default paragraph style for the document will be the second item in the list, so you could use the value of 1 for selectedIndex.

Of course, you could eliminate the need for choosing the paragraph style, and just define the style as part of the script. But that's more than I think you want to deal with at this point. (1. Remove the choice from the dialog, and 2. specify the style by name.)

Hope this gets you started in the right direction.