/**
* Returns get parameters.
*
* If the desired param does not exist, null will be returned
*
* @example value = $.urlparameter("paramName");
*/
 (function($) {
 $.urlparameter = function(strParamName) {
 	  var strReturn = "";
	  var strHref = window.location.href;
	  var bFound=false;

	  var cmpstring = strParamName + "=";
	  var cmplen = cmpstring.length;

	  if ( strHref.indexOf("?") > -1 ){
	    var strQueryString = strHref.substr(strHref.indexOf("?")+1);
	    var aQueryString = strQueryString.split("&");
	    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ){
	      if (aQueryString[iParam].substr(0,cmplen)==cmpstring){
	        var aParam = aQueryString[iParam].split("=");
	        strReturn = aParam[1];
	        bFound=true;
	        break;
	      }

	    }
	  }
	  if (bFound==false) return null;
	  return strReturn;
};

 })(jQuery);