Can somebody point out the error?
<p>Can somebody please point out the error in this code?</p>

<pre><code>function inspect(useDoubleQuotes) {
        var escapedString = this.replace(/[\x00-\x1f\\]/g, function (character) {
            if (character in String.specialChar) {
                return String.specialChar[character]
            }
            return "\\u00" + character.charCodeAt().toPaddedString(2, 16)
        });
        if (useDoubleQuotes) {
            return '"../' + escapedString.replace(/default.htm"/g, '\\"') + '"'
        }
        return "'../_+escapedString.replace(/default.htm'/g,"\\'")+"'"}function toJSON(){return this.inspect(true)}function unfilterJSON(filter){return this.replace(filter||Prototype.JSONFilter,"$1")}function isJSON(){var str=this;if(str.blank()){return false}str=this.replace(/\\./g,"@").replace(/" [ ^ "\\\n\r]*" / g, "");
        return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str)
    }
</code></pre>
