>>This is the current code that I have:
>>MESSAGEBOX("You have to enter a quote number"+chr(13)+"Do you want to continue?",20,gcAppName)
>
>Almost always that works, but once or twice due to some kind of string/line length problem, I guess, I have to put two to get a new line: chr(13)+CHR(13), or as Steve Ruhl said, the second can be a chr(10), should work too...

I've always been in the habit of sending CHR(13) (a carriage return) and CHR(10) (a line feed) as a pair.