wait function not working

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quick question. trying code here, whenever press button, pin 5 high. shouldn't delay? know going wrong here?

code: [select]
void wait(long timenum) {
  delaymicroseconds(timenum*995);
}

while (digitalread(button) == low) {}//wait until button pushed before starting light show

  wait(5358);
  digitalwrite(5, high);

quote
us: number of microseconds pause (unsigned int)
...is reference page says.

so, 22 milliseconds.
not quite "immediately", close in human terms.


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