/* Copyright (c) 2006-2007 Mathias Bank (http://www.mathias-bank.de)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * Version 2.1
 *
 * Thanks to:
 * Hinnerk Ruemenapf - http://hinnerk.ruemenapf.de/ for bug reporting and fixing.
 * Tom Leonard for some improvements
 *
 */
jQuery.fn.extend(
{
	/**
	 * Returns get parameters.
	 *
	 * If the desired param does not exist, null will be returned
	 *
	 * To get the document params:
	 * @example value = $(document).getUrlParam('paramName');
	 *
	 * To get the params of src or href attributes of a given html element
	 * @example value = $('#imgLink').getUrlParam('paramName');
	 */
	getUrlParam: function(strParamName)
	{
		strParamName = escape(unescape(strParamName));

		var returnVal = new Array();
		var qString = null;

		if ($(this).attr('nodeName') == '#document') {
			if (window.location.search.search(strParamName) > -1) {
				qString = window.location.search.substr(1, window.location.search.length).split('&');
			}
		} else if ($(this).attr('src') != 'undefined') {
			var strHref = $(this).attr('src');
			if (strHref.indexOf('?') > -1) {
				var strQueryString = strHref.substr(strHref.indexOf('?') + 1);
				qString = strQueryString.split('&');
			}
		} else if ($(this).attr('href') != 'undefined') {
			var strHref = $(this).attr('href');
			if (strHref.indexOf('?') > -1) {
				var strQueryString = strHref.substr(strHref.indexOf('?') + 1);
				qString = strQueryString.split('&');
			}
		}

		if (qString != null) {
			for (var i = 0; i < qString.length; i++) {
				if (escape(unescape(qString[i].split('=')[0])) == strParamName) {
					returnVal.push(qString[i].split('=')[1]);
				}
			}
		}

		switch (returnVal.length)
		{
			case 1 :
				return returnVal[0];
				break;
			default :
				return returnVal;
		}

		return null;
	}
});