// Javascript funciton to be called via ajax
// calls nav.cgi
// Requires querystring.js to define QueryString class.

/***** 
  Temporarily include the content of querystring.js
  because it isn't getting loaded until the next time
  that the webserver is restarted.
  Sometime after the next webserver restart (this is 2010-04-23)
  This portion can be removed.
********/

function Querystring(qs) { // optionally pass a querystring to parse
	this.params = {};
	
	if (qs == null) qs = location.search.substring(1, location.search.length);
	if (qs.length == 0) return;

// Turn <plus> back to <space>
// See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
	qs = qs.replace(/\+/g, ' ');
	var args = qs.split('&'); // parse out name/value pairs separated via &
	
// split out each name=value pair
	for (var i = 0; i < args.length; i++) {
		var pair = args[i].split('=');
		var name = decodeURIComponent(pair[0]);
		
		var value = (pair.length==2)
			? decodeURIComponent(pair[1])
			: name;
		
		this.params[name] = value;
	}
}

Querystring.prototype.get = function(key, default_) {
	var value = this.params[key];
	return (value != null) ? value : default_;
}

Querystring.prototype.contains = function(key) {
	var value = this.params[key];
	return (value != null);
}


/********************************************************************

End of content included from querystring.js

*************************************************************************/


function journalsNavCgi () {
	var url = window.location.pathname;
        var pagingLink;
        var jrnlParam;
        var qs = new Querystring();

        pagingLink = qs.get('pagingLink');

        if ( pagingLink ) {
            pagingLink = encodeURIComponent(pagingLink);
        }


        if ( qs.contains('jrnl') ) {
            jrnlParam = qs.get('jrnl');
        }

        var requestString = 
            '/cgi-bin/journals/nav.cgi?url='+encodeURIComponent(url);
        if ( pagingLink ) {
            requestString += '&pagingLink='+pagingLink;
        }
        if ( jrnlParam ) {
            requestString += '&jrnl='+jrnlParam;
        }

	makeRequest(requestString, 'nav_cgi');
}

if (window.addEventListener) {
	window.addEventListener('load', journalsNavCgi, false); 
} else if (window.attachEvent) {
	window.attachEvent('onload', journalsNavCgi);
}