convert characters to their unicode equivalents

gistfile1.js

function toUnicode(str) {
    var unicodeStr = '',
        i = 0,
        strlen = str.length,
        theUnicode;
    for (; i < strlen; i++) {
        code = str.charCodeAt(i).toString(16).toUpperCase();
        while (code.length < 4) {
            code = '0' + code;
        }
        code = '\\u' + code;
        unicodeStr += code;
    }
    return unicodeStr;
}