[buckngnr11]

I'm just starting to use some scheme language but I can't find the correct way to implement an if function. I attached my code, which works fine generally. You'll see in line 28 it pushes the "ok" button if the dialog box pops up that warns that the mesh and settings have changed. I want to put this operation in a if statement. If that warning doesn't appear right now, the process fails at that line. How do I put it into an if statement such that if the warning dialog box appears, click ok, if it doesn't, continue.