(function ($, undefined, width){ 
'$:nomunge'; 
$.scrollbarWidth = function (){ 
var parent, child; 
if (width === undefined) { 
parent = $('<div style="width:50px;height:50px;overflow:auto"><div/></div>').appendTo('body'); 
child = parent.children(); 
width = child.innerWidth() - child.height(99).innerWidth(); 
parent.remove(); 
} 
return width; 
} 
; 
} 
)(jQuery);