var offset = $("selector").offset();
offset.top   // Top position, relative to the top of the page
offset.left  // Left position, relative to the left of the page

var absolute_coordinates = $('#mydiv').offset(); // top and left with respect to document

   var relative_coordinates = $('#mydiv').position(); //top and left with respect to parent

   alert('#mydiv is ' + relative_coordinates.top
          + 'px below from parent and absolute_coordinates.top +
         'px below from document');

$(".divItem").click(function(){
    alert("Left is : "+$(this).offset().left)
});