Get an element's position using JS

getElementPosition.js

      function getElementPosition(element)
      {
          var x = element.offsetLeft;
          var y = element.offsetTop;
          
          var parent = element;
          
          while (parent = parent.offsetParent)
          {
            x += parent.offsetLeft;
            y += parent.offsetTop;
          }
          
          return [x, y];
      }