debug this line, bug on vertical mode

[Ayrinsoft]

// calculate the distance
//_dist = options.width * _page.length + ( options.margin * _page.length );

if (options.orientation === "horizontal") {
_dist = options.width * _page.length + (options.margin * _page.length);
_animOpts = { scrollLeft: "+=" + _dist };
} else {
_dist = options.height * _page.length + (options.margin * _page.length);
_animOpts = { scrollTop: "+=" + _dist };
}

on vertical mode you set options.width, replace with height ;)