jQuery(document).ready( 

function () { 

$('#banner').mousedown( 

function (event) { 

var isMove = true; 

var abs_x = event.pageX - $('div.moveBar').offset().left; 

var abs_y = event.pageY - $('div.moveBar').offset().top; 

$(document).mousemove(function (event) { 

if (isMove) { 

var obj = $('div.moveBar'); 

obj.css({'left':event.pageX - abs_x, 'top':event.pageY - abs_y}); 

} 

} 

).mouseup( 

function () { 

isMove = false; 

} 

); 

} 

); 

} 

);