/*****************************************************************************
  hoopty.js - An AJAX-like external JavaScript loader with the much more
  'sane' security policy requiring only that url match document.domain.

  Software License Agreement (BSD License)

  Copyright (c) 2007 by Brian Ecker.
  All rights reserved.

  Redistribution and use of this software in source and binary forms, with 
  or without modification, are permitted provided that the following 
  conditions are met:

  * Redistributions of source code must retain the above
    copyright notice, this list of conditions and the
    following disclaimer.

  * Redistributions in binary form must reproduce the above
    copyright notice, this list of conditions and the
    following disclaimer in the documentation and/or other
    materials provided with the distribution.

  * Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the copyright holder.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 
  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

function loadJavaScript(url, callback)
{
	var argsre = new RegExp('\\?');
	var urlre = new RegExp('^[^:]+://');
	var domainre = new RegExp('^[^:]+://([^@]@)*([A-Z0-9\.\-]+)(:[0-9]+)*/','i');

	var str = new String(url);
	if (str.match(urlre)) {
		var parts = str.match(domainre);
		if (!parts || !parts[2]) {
			throw("Improperly formatted URL: "+url);
			return;
		}
		var tmp1 = new String(parts[2]);
		var tmp2 = new String(document.domain);

		var urldomain = tmp1.toLowerCase();
		var docdomain = tmp2.toLowerCase();

		urldomain = urldomain.substring(urldomain.length 
						- docdomain.length);
		if (urldomain!=docdomain) {
			throw("URL domain '"+urldomain+"' does not match document.domain '"+docdomain+"'");
			return;
		}
	}

	if (str.match(argsre)) {
		str = str + '&';
	} else {
		str = str + '?';
	}
	var rnd = Math.round(Math.random()*10000000);
	str = str + 'noCacheOrd=' + rnd;

	var obj = document.createElement("script");
	obj.setAttribute("type", "text/javascript");
	obj.setAttribute("src", str);
	if ((callback)) {
		if (navigator.appName=='Microsoft Internet Explorer') {
			obj.onreadystatechange = function () {
				if (this.readyState=='loaded') {
					callback();
				}
			}
		} else {
			obj.onload = callback;
		}
	}

	var head = document.getElementsByTagName("head").item(0);
	head.appendChild(obj);
}