Outputting debug messages

[eluser]pickledegg2[/eluser]
I'm working on a mass of if/else statements, and its getting pretty confusing. Is there a way of getting some messages out to the browser in some way without breaking my cookie functions, as if I do a straight echo it obviously sends headers and causes my cookie operations to crash and burn...

I've got the profiler enabled and it works lovely for my database queries, time taken etc, but I want to stick a load of notice messages into my if/else's.

Thanks.