scrollbarWidth

gistfile1.txt

function scrollbarWidth()
{
    var $inner = jQuery('<div style="width: 100%; height:200px;">test</div>'),
        $outer = jQuery('<div style="width:200px;height:150px; position: absolute; top: 0; left: 0; visibility: hidden; overflow:hidden;"></div>').append($inner),
        inner = $inner[0],
        outer = $outer[0];
 
    jQuery('body').append(outer);
    var width1 = inner.offsetWidth;
    $outer.css('overflow', 'scroll');
    var width2 = outer.clientWidth;
    $outer.remove();
 
    return (width1 - width2);
}