Procedure:
step 1: Open flash 8
step 2: Select flash document
step 3: select 1st layer, 1st frame on that document and write source code on Actions Frame
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Source code:
function randRange(minNum, maxNum, decPl)
{
  trace("random number between"+minNum+" and "+maxNum+ "is");
  if(decp1==undefined)
  decp1=0;
  else
  decp1=decp1;
  var rangeDiff = (maxNum - minNum) * Math.pow(10, decPl) + 1;
  var randVal = Math.random(  ) * rangeDiff;
  randVal = Math.floor(randVal);
  randVal /= Math.pow(10, decPl);
  randVal += minNum;
  return Math.floor(randVal, Math.pow(10, -decPl));
}
trace(randRange(100,250,0));