Javascript Distance Library

distance.js

$(document).ready(function(){
  function distance(element) {

      // About object is returned if there is no 'element' parameter
      var about = {
          Version: 0.1,
          Author: "James Qualls",
          Created: "Dec 5th, 2012",
          Updated: "Not yet"
      };

      if (element) {

          // Avoid clobbering the window scope:
          // return a new distance object if we're in the wrong scope
          if (window === this) {
              return new distance(element);
          }

          // We're in the correct object scope:
          // Init our element object and return the object
          this.e = document.querySelector(element);
          return this;
      } else {
      // No 'element' parameter was given, return the 'about' object
          return about;
      }
    };
    
    /*  Prototype Functions
    ============================*/
    distance.prototype = {
      top:    function () {
                  obj = $(this.e).offset();
                  distanceToTop = obj.top;
                return distanceToTop;
              },

      bottom: function () {
                var space = window.innerHeight - this.e.offsetTop + this.e.offsetHeight;
                    windowHeight = document.body.offsetHeight,
                    distanceToBottom = windowHeight - space;
                return distanceToBottom;
              },
      height: function (){
                var height = this.e.offsetHeight;
                return height;
              }
      };

      $(".stack1").click(function() {
        var vscroll = (document.all ? document.scrollTop : window.pageYOffset);
        console.log("top: "+distance('div.stack1').top());
        console.log("bottom: "+distance('div.stack1').bottom());
        console.log("height: "+distance('div.stack1').height());
        console.log("vscroll: "+vscroll);
      });

      $(".stack2").click(function() {
        var vscroll = (document.all ? document.scrollTop : window.pageYOffset);
        console.log("top: "+distance('div.stack2').top());
        console.log("bottom: "+distance('div.stack2').bottom());
        console.log("height: "+distance('div.stack2').height());
        console.log("vscroll: "+vscroll);
      });

      $(".stack3").click(function() {
        var vscroll = (document.all ? document.scrollTop : window.pageYOffset);
        console.log("top: "+distance('div.stack3').top());
        console.log("bottom: "+distance('div.stack3').bottom());
        console.log("height: "+distance('div.stack3').height());
        console.log("vscroll: "+vscroll);
      });

      $(".stack4").click(function() {
        var vscroll = (document.all ? document.scrollTop : window.pageYOffset);
        console.log("top: "+distance('div.stack4').top());
        console.log("bottom: "+distance('div.stack4').bottom());
        console.log("height: "+distance('div.stack4').height());
        console.log("vscroll: "+vscroll);
      });

});