contains.js

jQuery.expr[':'].contains = function(a, i, m) {
    var rExps=[
        {re: /[\xC0-\xC6]/g, ch: "A"},
        {re: /[\xE0-\xE6]/g, ch: "a"},
        {re: /[\xC8-\xCB]/g, ch: "E"},
        {re: /[\xE8-\xEB]/g, ch: "e"},
        {re: /[\xCC-\xCF]/g, ch: "I"},
        {re: /[\xEC-\xEF]/g, ch: "i"},
        {re: /[\xD2-\xD6]/g, ch: "O"},
        {re: /[\xF2-\xF6]/g, ch: "o"},
        {re: /[\xD9-\xDC]/g, ch: "U"},
        {re: /[\xF9-\xFC]/g, ch: "u"},
        {re: /[\xC7-\xE7]/g, ch: "c"},
        {re: /[\xD1]/g, ch: "N"},
        {re: /[\xF1]/g, ch: "n"}
    ];

    var element = $(a).text();
    var search  = m[3];

    $.each(rExps, function() {
         element    = element.replace(this.re, this.ch);
         search     = search.replace(this.re, this.ch);
    });

    return element.toUpperCase()
        .indexOf(search.toUpperCase()) >= 0;
};