function pirefresh(url) {
	var revolve = document.getElementById('pirevolvegif').src;
	document.getElementById('pistudylist').innerHTML = '<div style="text-align: center;"><img style="margin: 50% 50%;" src="'+revolve+'"></div>';
	var item = document.getElementById('piitemid').innerHTML;

var XHRCheckin = new Ajax(url + '&tmpl=component&ajax=1&Itemid='+item, {
			method: 'get',
			onComplete: function( response ) {
				var html = response.split("<!-- **pi ajax list break** -->");
				document.getElementById('pistudylist').innerHTML = html[1];
				addthis.toolbox(".addthis_toolbox");
			}
		}).request();
		
}

function pifajaxbuildurl()
{
						var getbook = null;
						var getministry = null;
						var getseries = null;
						var getdate = null;
						var getteacher = null;
						
						if (document.getElementById('filter_book'))
						{getbook = document.getElementById('filter_book').value;}
						if (document.getElementById('filter_teacher'))
						{getteacher = document.getElementById('filter_teacher').value;}
						if (document.getElementById('filter_series'))
						{getseries = document.getElementById('filter_series').value;}
						if (document.getElementById('filter_year'))
						{getdate = document.getElementById('filter_year').value;}
						if (document.getElementById('filter_ministry'))
						{getministry = document.getElementById('filter_ministry').value;}
						var checkvar = document.pimessages.checkvar.value;
						
						var url = 'index.php?option=com_preachit&view=studylist&filter_book='+getbook+'&filter_teacher='+getteacher+
						'&filter_series='+getseries+'&filter_year='+getdate+'&filter_ministry='+getministry+'&checkvar='+checkvar;
						pirefresh(url);
						
						return false;
}