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function factorial(n) {
        return n === 0 ? 1 : n <= 2 ? n : n * factorial(n - 1);
};

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function parseURL(url){
	var l = document.createElement("a");
	l.href = url;
    // output object
	var o = {
		// parts of parsed URL
		hash: l.hash,
		host: l.host,
		hostname: l.hostname,
		href:l.href,

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(function(){
    if (window.addEventListener) window.addEventListener("load", init, false);
    else if (window.attachEvent) window.attachEvent("onload", init);
    function init(){}
})();

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if (!window.Node) {
    var Node = {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_FRAGMENT_NODE: 11
    }
}

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javascript:var b="Browser Overview: \n";for(var p in navigator){b+=p+": "+navigator[p]+"\n"};alert(b);

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/** Universal function for unobtrusive adding event handler to element.
 *  It doesn't replace yet binded handler, for example in the tag.
 *  It returns value of the new handler, so values of previous handlers
 *  will be replaced.
 *	
 *  Arguments:
 *      element: target HTML element of binding,
 *      event: string with name of the event, for example, 'onclick',
 *      newHandler: function to be binded.
**/

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// from Flanagan book
window.onerror = function (msg, url, line) {
	if (onerror.num++ < onerror.max) {
		alert("Error: " + msg + "\n" + url + ":" line);
		return true;
	}
}
onerror.max = 3;
onerror.num = 0;

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// From Flanagan's book
// Recieve all document cookies
var allcookies = document.cookie;
// Search desired cookie
var pos = allcookies.indexOf("version=");
// If founded, extract it and use it's value
if (pos != -1) {
	var start = pos + 8;
	var end = allcookies.indexOf(";". start); // Start of value
	if (end == -1) end = allcookies.length; // End of value

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/**
Without waiting in browsers Opera and Webkit:
	if pics are allowed
		'img.complete' puts on 'true' only after event
		'onload', 'onerror' or 'onabort'
	if pics are not allowed
		instantly 'img.complete' becomes 'true', and 'onload' doesn't occurs
у IE:
	if pics are allowed
		property 'readyState' [*] changes two times

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function randomInt(n) {
    return Math.round(Math.random() * n);
}