making timer values 16 bit may (often will) lead to either atomicity problems or other problems (too may 'gaps' with interrupts disabled.

the better solution is to make the timer variables 8 bit and if more than 8 bits of delay is required simply go
if (!timer){msb--;
if(!msb){timed out

I would like to see yout timer ISR but I have no intention of searching throyugh a list of other stuff to find it, provide a link to the actual code, not to a list.

If you will feel that I am not 'civil' with the above comment, go cry somewhere else

Erik