gistfile1.js

        getMousePos = function( e ) {
          return ( e.pageX || e.pageY ) ? {
            x: e.pageX,
            y: e.pageY
          } : ( e.clientX || e.clientY ) ? {
            x: e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft,
            y: e.clientY + document.body.scrollTop + document.documentElement.scrollTop
          } : null;
        },

        getLinkPos = function( a ) {
          var obj = a, left = 0, top = 0;

          if( ! obj.offsetParent ) {
            return false;
          }

          do {
            left += obj.offsetLeft;
            top += obj.offsetTop;
          } while( obj = obj.offsetParent );

          return { x: left, y: top };
        },