util.js

var util = {
  trim : function (arr2) {
    arr1 = new Array();
    for(j = 0; j < arr2.length; j++)
        if(arr2[j] != "")
            arr1[arr1.length] = arr2[j];
    arr2.length = arr1.length;
    for(j = 0; j < arr1.length; j++)
        arr2[j] = arr1[j];
    return arr2;
  },
  isNumber : function (n) {
    return !isNaN(parseFloat(n)) && isFinite(n);
  },
  escapeHTML : function (unsafe) {
    return unsafe
      .replace(/&/g, "&amp;")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;")
      .replace(/'/g, "&#039;");
  }
};