a javascript keyword highlighting sinippet. original -> http://scott.yang.id.au/2004/06/se-hilite/

highlight_keywords.js

Hilite = {
    exact: false,
    style_name: 'hilite',
    style_name_suffix: true
};

Hilite.hiliteHTML = function(html, query) {
    var re = new Array();
    for (var i = 0; i < query.length; i ++) {
        query[i] = query[i].toLowerCase();
        if (Hilite.exact)
            re.push('\\b'+query[i]+'\\b');
        else
            re.push(query[i]);
    }

    re = new RegExp('('+re.join("|")+')', "gi");

    var subs;
    if (navigator.userAgent.search(/Safari/) >= 0 || 
        !Hilite.style_name_suffix) 
    {
        subs = '<span class="'+Hilite.style_name+
            (Hilite.style_name_suffix?'1':'')+'" style="color: red; font-weight:bold">$1</span>'
    } else {
        var stylemapper = {};
        for (var i = 0; i < query.length; i ++)
            stylemapper[query[i]] = Hilite.style_name+(i+1);
        subs = function(match) {
            return '<span class="'+stylemapper[match.toLowerCase()]+'" style="color: red; font-weight:bold">'+match+
                '</span>';
        };
    }

    var last = 0;
    var tag = '<';
    var skip = false;
    var skipre = new RegExp('^(script|style|textarea)', 'gi');
    var part = null;
    var result = '';

    while (last >= 0) {
        var pos = html.indexOf(tag, last);
        if (pos < 0) {
            part = html.substring(last);
            last = -1;
        } else {
            part = html.substring(last, pos);
            last = pos+1;
        }

        if (tag == '<') {
            if (!skip)
                part = part.replace(re, subs);
            else
                skip = false;
        } else if (part.match(skipre)) {
            skip = true;
        }

        result += part + (pos < 0 ? '' : tag);
        tag = tag == '<' ? '>' : '<';
    }

    return result;
};

Hilite.hiliteElement = function(elm, query) {
    if (!query)
      return;

    var oldhtml = elm.innerHTML;
    var newhtml = Hilite.hiliteHTML(oldhtml, query);

    if (oldhtml != newhtml)
        elm.innerHTML = newhtml;
};

Hilite.hilite = function(q) {
    var e = null;
    if (q && (e = document.body))
    {
      Hilite.hiliteElement(e, q);
    }
};

var towns = ["尼ケ崎横町", "家永町一町目", "一町目", "浮田町", "蛭子町", "上堀川町", "亀屋町", "北伊勢屋町", "北蟹屋町", "木屋之町", "清元町", "金馬場町", "櫛笥町", "荒神町", "講堂町", "小伝馬町", "小山町", "坤高町", "西院町", "左馬松町三町目", "下堀川町", "下丸屋町", "十四軒町", "主税町", "聚楽町", "白銀町", "新御幸町", "大黒町", "田中町", "田村備前町", "中書町", "天秤町", "天秤丸町", "直家町", "長尾町", "中務町", "中之町", "中御門横町", "中村町", "西神明町", "西辰巳町", "西天秤町", "西橋詰町", "西丸太町二町目", "二本松町", "秤口町", "橋西二町目", "東神明町", "東辰巳町", "東天秤町", "菱屋町", "福島町", "分銅町", "弁天町", "桝屋町", "丸屋町", "南伊勢屋町", "南蟹屋町", "南清水町", "元福大明神町", "森中町", "山本町", "吉野町四町目", "四町目", "藁屋町"]
Hilite.hilite(towns);