$(document).ready(function () {        
        $('.wrapper_content').mousedown(function (event) {
            $(this)
                .data('down', true)
                .data('y', event.clientY)
                .data('scrollTop', this.scrollTop);
                
            return false;
        }).mouseup(function (event) {
            $(this).data('down', false);
        }).mousemove(function (event) {
            if ($(this).data('down') == true) {
                this.scrollTop = $(this).data('scrollTop') + $(this).data('y') - event.clientY;
            }
        }).mousewheel(function (event, delta) {
            this.scrollTop -= (delta * 30);
        }).css({
            'overflow' : 'hidden',
            'cursor' : '-moz-grab'
        });
    });
    
    $(window).mouseout(function (event) {
        if ($('.wrapper_content').data('down')) {
            try {
                if (event.originalTarget.nodeName == 'BODY' || event.originalTarget.nodeName == 'HTML') {
                    $('.wrapper_content').data('down', false);
                }                
            } catch (e) {}
        }
    });