function updateFlag(field) {
	var id = field.value;
	document.getElementById("flag").src = "img/flags/"+id+".png";
}

function toggleView(view, link) {
	if(document.getElementById(view).style.display == "block") {
		document.getElementById(view).style.display = "none";
		document.getElementById(link).innerHTML = "<a href=\"javascript:toggleView('lesson_answers_content', 'toggle_link')\">show</a>";
	} else {
		document.getElementById(view).style.display = "block";
		document.getElementById(link).innerHTML = "<a href=\"javascript:toggleView('lesson_answers_content', 'toggle_link')\">hide</a>";
	}
}

function popupUsers() {
	userPopup = window.open("user_popup.php", "userPopup", "status=0,location=0,resizable=0,scrollbars=0,width=650,height=250");
}

function popupTOC() {
	var url = "contents.php";
	var name = "toc";
	var options = "location=0,status=0,toolbar=0,scrollbars=1,menubar=1,resizable=0,width=750,height=600";
	window.open(url, name, options);
}

function printTOC() {
	var url = "contents.php?print=1";
	var name = "toc";
	var options = "location=0,status=0,toolbar=0,scrollbars=1,menubar=1,resizable=0,width=750,height=600";
	var popup = window.open(url, name, options);
}