function refreshDocJSTOD(frequency) {
  var max = tips.length;
  var index = -1;
  switch(frequency) {
    case "sky":
      max = sky.length;
      index = getRandomIndex(max);
      str = sky[index];
      break;
    case "now": // Default
    default:
      max = tips.length;
      index = getRandomIndex(max);
      str = tips[index];
      break;
   }
 document.write(str);
}

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

var tips = new Array();
var sky  = new Array();