Chrome and Firefox/Greasemonkey user script that allows arrow keys to move between cells on the ATAAPS labor screen, shows leave information when hovering over link, and other enhancements.

ataaps_interface_enhancements.user.js

// ==UserScript==
// @match https://ataaps.csd.disa.mil/*
// @description Allows arrow keys to move between cells on the ATAAPS labor screen, shows leave information when hovering over link, and other enhancements.
// @name ATAAPS Interface Enhancements
// ==/UserScript==

function addJQuery(callback) {
    var script = document.createElement("script");
    script.setAttribute("src", "//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js");
    script.addEventListener('load', function() {
        var script = document.createElement("script");
        script.textContent = "window.jQ=jQuery.noConflict(true);(" + callback.toString() + ")();";
        document.body.appendChild(script);
    }, false);
    document.body.appendChild(script);
}

// the guts of this userscript
function main() {
    // Note, jQ replaces $ to avoid conflicts.

    // only modify the labor screen
    if (jQ("#laborForm").length == 0)
        return;

    function almostEq(a, b) {
        if (a == b || Math.abs(a - b) < 0.000001) return true;
        else return false;
    }

    // disable autocomplete, as it gets in the way of moving to the next row
    jQ("input[type='text']").attr('autocomplete', 'off')

    jQ("input[type='text']").blur(function (e) {
        var input = jQ(this);

        // parse string to number
        var v = parseFloat(input.val(), 10);
        if (!v) return;

        // split number into whole and fractional parts
        var frac = v - Math.floor(v);
        var whole = v - frac;

        // convert from normal hour fractions to ATAAPS hour representation
        if (almostEq(frac, 0.25)) frac = 0.15;
        else if (almostEq(frac, 0.5)) frac = 0.30;
        else if (almostEq(frac, 0.75)) frac = 0.45;

        // ensure fractional part is in 15 minute increments, change border if not
        if (almostEq(frac, 0) || almostEq(frac, 0.15) || almostEq(frac, 0.30) || almostEq(frac, 0.45)) {
            input.val((whole + frac).toFixed(2));

            // restore border to normal (TODO: better way?)
            input.css("border", "initial");
            input.css("border", "2px inset");
        } else {
            input.css("border", "2px solid red");
        }
    });

    jQ("input[type='text']").keyup(function (e) {
        var input = jQ(this),
            td = input.closest("td"),
            next;

        switch (e.which) {
            case 37:
                next = td.prev().find("input");
                break;
            case 39:
                next = td.next().find("input");
                break;
            case 38:
                // make robust to other elements besides td in each tr
                tdIndex = input.closest("tr").find("td").index(td);
                next = input.closest("tr").prev().find("td:eq(" + tdIndex + ")").find("input");
                break;
            case 40:
                // make robust to other elements besides td in each tr
                tdIndex = input.closest("tr").find("td").index(td);
                next = input.closest("tr").next().find("td:eq(" + tdIndex + ")").find("input");
                break;
        }

        if (next) {
            next.focus().select();
        } else {
            // only allow numbers and period
            var newval = this.value.replace(/[^0-9\.]/g, '');
            if (this.value != newval) this.value = newval;
        }
    });

    // show leave info when hovering over "View Leave" link
    $("a:contains('View')").hover(function () {
        // Hover over code
        var title = "Please wait while leave information loads";
        $(this).data('tipText', title).removeAttr('title');
        $('<p class="tooltip"></p>')
            .text(title)
            .css({'display': 'none', 'position': 'absolute'})
            .appendTo('body')
            .fadeIn('slow')
            .load('ControllerServlet?operation=LeaveView table table table:eq(2)');
    }, function () {
        // Hover out code
        $(this).attr('title', $(this).data('tipText'));
        $('.tooltip').remove();
    }).mousemove(function (e) {
        var mousex = e.pageX + 20; //Get X coordinates
        var mousey = e.pageY + 10; //Get Y coordinates
        $('.tooltip')
            .css({
            top: mousey,
            left: mousex
        })
    });
}

// load jQuery and execute the main function
addJQuery(main);