Potential fix for Bootstrap's poor menu detection of screen edges.

gistfile1.js

$(".dropdown-toggle").click(function(e) {
    var menu = $(this).next('.dropdown-menu'),
        mousex = e.pageX + 20, //Get X coodrinates
        mousey = e.pageY + 20, //Get Y coordinates
        menuWidth = menu.width(), //Find width of tooltip
        menuHeight = menu.height(), //Find height of tooltip
        menuVisX = $(window).width() - (mousex + menuWidth), //Distance of element from the right edge of viewport
        menuVisY = $(window).height() - (mousey + menuHeight); //Distance of element from the bottom of viewport

    if (menuVisX < 20) { //If tooltip exceeds the X coordinate of viewport
        menu.css({'left': '-89px'});
    } if (menuVisY < 20) { //If tooltip exceeds the Y coordinate of viewport
        menu.css({
            'top': 'auto',
            'bottom': '100%',
        });
    }
});