hilite.js

// ==UserScript==
// @name        Highlight Words
// @author      bpm
// @version     1.1
// @description     Highlights works from an array
// @include     https://*
// @include     http://*
// ==/UserScript==
// 1.1 Updated by Frenzie, added easy to configure wordlist
(function () {
    var wordlist=[
        /*@Wordlist (quote properly and use commas between values)@string@*/

"and",
"und",
"or",
"oder",

/*@*/
    ];
    // other config
    var highlightBgColor = /*@Highlight background color@string@*/'blue'/*@*/;
    var highlightColor = /*@Highlight font color@string@*/'yellow'/*@*/;

    function hilite(text){
        var count=0,dv;
        dv=document.defaultView;
        function searchWithinNode(node,te,len){
            var pos,skip,spannode,middlebit,endbit,middleclone;
            skip=0;
            if(node.nodeType==3){
                pos=node.data.toUpperCase().indexOf(te);
                if(pos>=0){
                    spannode=document.createElement('SPAN');
                    spannode.style.backgroundColor=highlightBgColor;
                    spannode.style.color=highlightColor;
                    spannode.style.fontWeight='bold';
                    middlebit=node.splitText(pos);
                    endbit=middlebit.splitText(len);
                    middleclone=middlebit.cloneNode(true);
                    spannode.appendChild(middleclone);
                    middlebit.parentNode.replaceChild(spannode,middlebit);
                    ++count;
                    skip=1;
                }
            }
            else if(node.nodeType==1&& node.childNodes && node.tagName.toUpperCase()!='SCRIPT' && node.tagName.toUpperCase!='STYLE'){
                for (var child=0;child<node.childNodes.length;++child){
                    child=child+searchWithinNode(node.childNodes[child],te,len);
                }
            }
        return skip;
        }
        searchWithinNode(document.body,text.toUpperCase(),text.length);
    }

    document.addEventListener('DOMContentLoaded',function() {
        for (i=0; i<wordlist.length; i++) {
            hilite(wordlist[i]);
        }
    }, false);
})();