The Code

function refreshDocJSTOD(frequency) {
  var max = tips.length;
  var dateObj = new Date();
  switch(frequency) {
    case "month": // 0 - 11
      tipIndex = dateObj.getMonth();
      break
    case "dayOfTheMonth": // 1 - 31
      tipIndex = dateObj.getDate() - 1 // 0 - 30
      break;
    case "dayOfTheWeek": // 0 - 6
      tipIndex = dateObj.getDay();
      break;
    case "hour": // 0 - 23
      tipIndex = dateObj.getHours();
      break;
    case "now": // Default
    default:
      tipIndex = getRandomIndex(max);
   }
 tipIndex = tipIndex % max;
 document.write(tips[tipIndex]);
}

function getRandomIndex(max) {
 var randomNum = Math.random();
 randomNum = randomNum * max;
 randomNum = parseInt(randomNum);
 if(isNaN(randomNum)) randomNum = 0; // for Netscape
 return randomNum;
}

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