Et forsøk på litt fargehysteri

rbkwebting.js

// ==UserScript==
// @name         Fixrbkweb
// @version      1.0
// @description  Legg til ukedager i rbkweb.no sin kampoversikt
// @author       Sinna mann
// @match        http://www.rbkweb.no/kamper*.php
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==

(function() {
    'use strict';
    // Your code here...
    var weekdays= ["Søn", "Man", "Tir", "Ons", "Tor", "Fre", "Lør"];

    // Endre for å matche dine preferanser her
    const colorResults = true,
          colorNextMatch = true,
          nextMatchColor = 'lightgreen',
          winColor = '#AAFFAA',
          drawColor = '#FFFFAA',
          lossColor = '#FFAAAA';
    // Sannsynligvis ikke behov for å tukle med noe under denne linja

    // Tegn vi vil bytte ut for å slippe å introdusere kjipe linjeskift
    var replacements = {
        ' ': ' ',
        '-': '‑'
    };

    var year = document.URL.match(/rbkweb\.no\/kamper(\d\d\d\d)\.php/)[1];
    var now = new Date();
    var foundNext = false;
    $("center > table > tbody > tr").has("td.kamp").each(function() {
        var match = $(this).children("td:first-child").html().match(/(\d*)\/(\d*)/);
        var myDateString = year + "-" + match[2] + "-" + match[1];
        var date = new Date(myDateString);
        var myday = date.getDay();
        $(this).children("td:first-child").html(weekdays[myday] +" "+match[1]+"/"+match[2]);

        var timeString = $(this).children("td").eq(3).text().match(/(\d\d):(\d\d)/);
        if(colorNextMatch && timeString) {
            var kampStart = new Date(myDateString + " " + timeString[1]+":"+timeString[2]);
            var kampSlutt = new Date(kampStart);
            kampSlutt.setMinutes(kampStart.getMinutes() + 105);
            if(!foundNext && kampSlutt >= now) {
                foundNext = true;
                $(this).children("td").css('background-color', nextMatchColor);
            }
        } else if(colorResults) {
            // Fargelegg resultater
            var resultColor = "grey";
            var homeMatch = $(this).children("td").eq(1).text().startsWith("Rosenborg");
            var goals = $(this).children("td").eq(3).text().match(/(\d+)-(\d*)/);
            if(goals) {
                if(goals[1]==goals[2])
                    resultColor = drawColor;
                if(goals[1]>goals[2]) {
                    resultColor = homeMatch ? winColor : lossColor;
                }
                if(goals[1]<goals[2]) {
                    resultColor = homeMatch ? lossColor : winColor;
                }
                $(this).children("td").eq(3).css('background-color', resultColor);
            }
        }

        // Fiks så ingen tabell-celler går over mer enn én linje.
        $(this).children("td").each(function(){
            var element = $(this);
            if(element.children("a").length > 0)
                element = element.children("a");
            var content = element.html();

            for(var rep in replacements) {
                content = content.replace(new RegExp(rep, "g"), replacements[rep]);
            }
            element.html(content);
        });
    });
})();

jQueryfied quite a bit more, now doing updates for all table cells in a loop, and using object properties to define the replacement characters. Such clever.