// DEPENDENCIES
// * /scripts/lesson.js
// 	* /scripts/toc.js
// * /scripts/global.js
window.onload = function() {
	loadLesson(getUrlVars()['subject'], getUrlVars()['chapter'], getUrlVars()['id']);
	updateGlobalElements();
	var btn = document.getElementById("top-back-btn");
	btn.setAttribute("href", `../?id=${getUrlVars()['subject']}`)
}

function getUrlVars() {
	var vars = [], hash;
	var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
	for (var i = 0; i < hashes.length; i++) {
		hash = hashes[i].split('=');
		vars.push(hash[0]);
		vars[hash[0]] = hash[1];
	}
	return vars;
}