/* 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.extend( {
	getUrlParam : function(strUrl, strParamName)
	{
		strParamName = escape(unescape(strParamName));
		var qString = strUrl.split("&");
		
		return jQuery.findUrlParam(qString, strParamName);
	},
	findUrlParam : function(qString, strParamName)
	{
		var returnVal = new Array();

		if (qString == null)
			return null;

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

		if (returnVal.length == 0)
			return null;
		else if (returnVal.length == 1)
			return returnVal[0];
		else
			return returnVal;
	}
});

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 a html-attribut (uses src attribute)
	 * @example value = $('#imgLink').getUrlParam("paramName");
	 */
	getUrlParam : function(strParamName)
	{
		strParamName = escape(unescape(strParamName));
		var qString = null;

		if ($(this).is(document))
		{
			if (window.location.search.search(strParamName) > -1)
			{

				qString = window.location.search.substr(1, window.location.search.length).split("&");
			}
		}
		else if (typeof $(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 (typeof $(this).attr("href") != "undefined")
		{

			var strHref = $(this).attr("href")
			if (strHref.indexOf("?") > -1)
			{
				var strQueryString = strHref.substr(strHref.indexOf("?") + 1);
				qString = strQueryString.split("&");
			}
		}
		else
		{
			return null;
		}

		return $.findUrlParam(qString, strParamName);
	}
});