Javascript not producing a random number

 quoteArray[1] = "some text" quoteArray[2] = "some different text" quoteArray[3] = "text again" quoteArray[4] = "completely different text" quoteArray[5] = "ham sandwich" 

 //Note: at this point in the function I have generated a random number once already and stored it in 'randomnumber' //I use this while statement to evaluate 'randomnumber' until the condition of it NOT being a number that has already been used and NOT being the last number is met. while(randomnumber === rotationArray[randomnumber] || randomnumber === lastnumber){ randomnumber = Math.floor(Math.random() * (quoteArray.length)); } 

  // Function to initialize the quoteObj
      function quoteObj (text, cname, ccompany, url, height) {
              this.text = text;
              this.cname = cname;
              this.ccompany = ccompany;
              this.url = url;
              this.height = height;
          }

  // Fill my Subject quotes with quote information from the XML sheet. 

      var qObj = new quoteObj ('', '', '', ''));
      var quoteArray = new Array ();
      var counter = 0;

  // review each XML element and load the data into an object that is then stored in an array
      $ .ajax ({
          type: "GET",
          url: "quotes.xml",
          dataType: "xml",
          success: function (xml) {
              $ (xml) .find ('quote').  each (function () {
                  quoteArray [counter] = new quoteObj ('', '', '', ''));
                  console.log (quoteArray [counter]);
                  quoteArray [counter] .text = $ (this) .find ('text').  text ();
                  quoteArray [counter] .cname = $ (this) .find ('customer_name').  text ();
                  quoteArray [counter] .ccompany = $ (this) .find ('customer_company').  text ();
                  quoteArray [counter] .url = $ (this) .find ('project').  text ();
                  ++ counter;
              });
          }
      });

  // This is the setion that generates my infinite loop problem.
  // I included all the other code in case people would ask specific questions about how an item was initialized, etc. 

  // Generate a random first citation then progress randomly through the whole set and start all over again.      

      var randomnumber = Math.floor (Math.random () * (quoteArray.length));
      var rotationArray = new array (quoteArray.length);
      var v = 0;
      var lastnumber = -1;

      bHeight = $ ('# rightbox').  height () + 50;
      var cHeight = 0;
      var divtoanim = $ ('# customerquotes').  parent ();

  //NO LINK//
  // Give a height to the inner shadow for the hidden overflow to work with the quotes.
      $ (divtoanim) .css ({'height': bHeight});

  // Rotate the Random Quotations function.
      setInterval (function () {
          randomnumber = Math.floor (Math.random () * (quoteArray.length));

  // check if the function loop should start at the beginning.
          if (v == (quoteArray.length)) {
              rotationArray.length = 0;
              v = 0;
          }
  // determine if the random number is at the same time different from any other random number generated before and it is not the same as the last random number
          while (randomnumber === rotationArray [randomnumber] || random_number === lastnumber) {
              randomnumber = Math.floor (Math.random () * (quoteArray.length));
          }   

          lastnumber = random number;
          rotationArray [randomnumber] = random number;
          ++ v;

  //NO LINK//
  // animation sequence
          $ ('# ctext, #cname').  animate ({'opacity': '0'}, 2000, function () {
              $ ('# ctext').  html (quoteArray [random number] .text);
              $ ('# cname').  html ('-' + quoteArray [random number] .cname);

              cHeight = $ ('# customerquotes').  height () + 50;
              adjustHeight (bHeight, cHeight, divtoanim);

              $ ('# ctext').  delay (500) .animate ({'opacity': '1'}, 500);
              $ ('# cname').  delay (1500) .animate ({'opacity': '1'}, 500);
          });
      }, 15000);

 var results = ['some text','some text2','some text3','some text4','some text5', /* ...etc */ ], randomable = results; function getRandomOffset( arr ) { var offset, len; if( arr.length < 1 ) return false; else if( arr.length > 1 ) offset = Math.floor(Math.random() * arr.length ); else offset = 0; arr.splice( offset, 1 ); return [ offset, arr ]; } while( res = getRandomOffset( randomable ) ) { // Set the randomable for next time randomable = res[1]; // Do something with your resulting index results[ res[0] ]; }