AVR delay_ms

When programming the AVR uC you have to remember that the delay_ms and delay_us functions will tie in the whole floating point library unless they are passed constants. This will always make the code too bloated to fit in anything less that 3K. So, it's right out for the ATtiny13 (1K Flash memory). I've been bitten by this twice now and the incidences were far enough appart that it took me 45 mins the second time to trace what was going on...

I was trying this:

delay_ms(delay);
if(i==0)
delay--;

but should have been increasing/decreasing the delay time by wrapping the delay call in a loop of variable length instead.