getDirection

var getDir = function( elem, e ) {       

  /** the width and height of the current div **/
  var w = elem.width();
  var h = elem.height();
  var offset = elem.offset();

  /** calculate the x and y to get an angle to the center of the div from that x and y. **/
  /** gets the x value relative to the center of the DIV and "normalize" it **/
  var x = (e.pageX - offset.left - (w/2)) * ( w > h ? (h/w) : 1 );
  var y = (e.pageY - offset.top  - (h/2)) * ( h > w ? (w/h) : 1 );

  /** first calculate the angle of the point, 
   add 180 deg to get rid of the negative values
   divide by 90 to get the quadrant
   add 3 and do a modulo by 4  to shift the quadrants to a proper clockwise TRBL (top/right/bottom/left) **/
  var direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180 ) / 90 ) + 3 )  % 4;

  /** return the direction **/ 
  switch(direction) {
   case 0:
      return 'top';
   break;
   case 1:
      return 'right';
   break;
   case 2:
         return 'bottom';
   break;
   case 3:
         return 'left';
   break;
  }

}