var addEvent = (window.addEventListener) ?

   (function(elm, type, event) {

      elm.addEventListener(type, event, false);

   }) : (window.attachEvent) ?

   (function(elm, type, event) {

      elm.attachEvent('on'+type, event);

   }) :

   (function(elm, type, event) {

      elm['on'+type] = event;

   }) ;



var Position = {

   offset: function(elm) {

      var pos = {};

      pos.x = this.getOffset('Left', elm);

      pos.y = this.getOffset('Top', elm);

      return pos;

   },



   getOffset: function(prop, el) {

      if(!el.offsetParent || el.offsetParent.tagName.toLowerCase() == "body")

         return el['offset'+prop];

      else

         return el['offset'+prop]+ this.getOffset(prop, el.offsetParent);

   }

};