// JavaScript Document

function fetchData(url,dataToSend,objectID) {
	var pageRequest = false;
	if (window.XMLHttpRequest) pageRequest = new XMLHttpRequest();
	else if (window.ActiveXObject) pageRequest = new ActiveXObject("Microsoft.XMLHTTP");
	else return false;
	pageRequest.onreadystatechange = function() {
		filterData(pageRequest,objectID);
	}
	if (dataToSend) {
		var sendData = 'sendData=' + dataToSend;
		pageRequest.open('POST',url,true);
		pageRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		pageRequest.send(sendData);
	} else {
		pageRequest.open('GET',url,true);
		pageRequest.send(null);
	}
}

function filterData(pageRequest,objectID) {
	var object = document.getElementById(objectID);
	if (pageRequest.readyState == 4) {
		if (pageRequest.status == 200) object.innerHTML += pageRequest.responseText;
		else if (pageRequest.status == 404) object.innerHTML += 'Sorry, that information is not currently available.';
		else object.innerHTML += 'Sorry, there seems to be some kind of problem.';
	} else {
		return;
	}
}

function getPageName() {
	var url = window.location.href;
	var parts = url.split('?');
	var page = parts[parts.length-1];
	return page;
}

function changePage(semester,objectID) {
	pageName1 = getPageName();
	pageName = semester+'/'+pageName1+'.html';
	fetchData(pageName,null,objectID);
}

function filterData(pageRequest,objectID) {
	var object = document.getElementById(objectID);
	if (pageRequest.readyState == 4 && (pageRequest.status == 200 || window.location.href.indexOf("http")==-1)) {
		document.getElementById(objectID).innerHTML = pageRequest.responseText;
	}
}