Help with Creating Custom Buttons

[kec161]

Does anyone have experience creating custom buttons?

We have a field called QA Reviewed that has the options Approved and Rejected. I'd like to add a button to the top of the Advanced View Details page where I could click it and it would set the custom QA Reviewed field to Approved. This would replace me updating the bug, scrolling to the custom QA reviewed field, selecting Approved and hitting OK.

I saw that I can customize the custom_function_default_print_bug_view_page_custom_buttons function in custom_function_api file but then I'm lost. Does anyone have some sample code that I could glance at?