gistfile1.js

  var numbers = new Array(5);
  numbers[0] = "10";
  numbers[1] = "20";
  numbers[2] = "30";
  numbers[3] = "40";
  numbers[4] = "50";

  for (var i=0; i < numbers.length; i++) {
    if(numbers[i] != 30) {
      document.write(numbers[i] + "<br />");      
    }
  }