old_contents: var suffix="";
       var prefix="Quizzes given: ";
      $('.counter').each(function() {
      var $this = $(this),
      countTo = $this.attr('data-count');  
      $({ countNum: $this.text()}).animate({
      countNum: countTo
      },
      {
      duration: 5000,
      easing:'linear',
      step: function() {
      $this.text( prefix + suffix+Math.floor(this.countNum));
      },
      complete: function() {
      $this.text(suffix+this.countNum);
      }
      });  
      });
  
new_contents: var suffix="";
       var prefix="Quizzes given: ";
      $('.counter').each(function() {
      var $this = $(this),
      countTo = $this.attr('data-count');  
      $({ countNum: $this.text()}).animate({
      countNum: countTo
      },
      {
      duration: 5000,
      easing:'linear',
      step: function() {
      $this.text( prefix + Math.floor(this.countNum));
      },
      complete: function() {
      $this.text(this.countNum);
      }
      });  
      });
  
subject: Update counter.js