if (button == 0)
{
Delay (value); //value delay for 5 sec
if (button == 0)
{
task2 ();
}
else
{
task1 ();
}
}

Jhon
I would use something like this in my main function

assume pushing the button makes button = 0 then the code delays and checks the state of the button again -- and depending on the state of the button task 1 or 2 will be preformed

you will have to create a Delay function

also if you start task 1 and 2 with a
while (button == 1)
you can break out of the task or mode by pushing the button

sorry about the half post

have fun
Casey