var errCode = location.search.substr(1) * 1;

function LoginOK() {
	var username;
	if (document.loginForm.username.value == '') {
		alert("You must enter a valid username and password to enter the site.");
		return false;

		if (confirm('You didn\'t enter a username.  Would you like to log in as a Guest?')) {
			username = "Guest";
			document.loginForm.username.value = "Guest";
		} else {
			document.loginForm.username.select();
			return false;
		}
	} else {
		username = document.loginForm.username.value;
	}
	
	if (username.substr(0,5).toLowerCase() != 'guest' && document.loginForm.password.value == '') {
		if (confirm('You didn\'t enter a password.  Would you like to log in as a Guest?')) {
			username = "Guest";
			document.loginForm.username.value = "Guest";
		} else {
			document.loginForm.password.select();
			return false;
		}
	}
	
	// store the user's name to fill in later
	var later = new Date();
	later.setFullYear (later.getFullYear() + 10);
	document.cookie = "lfiofoe=" + username + "; path=/; expires=" + later.toGMTString();
		
	return true;
}

function LoginFromReg(u, p) {
	document.loginForm.username.value = u;
	document.loginForm.password.value = p;
	LoginOK();	// stores the username cookie
	document.loginForm.submit();
	suppwin.close();
}

function ShowSupp(searchString) {
	OpenSuppWindow(searchString);	
}

var suppwin;
function OpenSuppWindow(searchString) {
	if (suppwin != null && !suppwin.closed)
		suppwin.focus();
	suppwin = window.open("supp.html?" + searchString, "loginSuppWindow", "top=20,left=20,width=750,height=600,menubar,resizable,scrollbars,status", true);
}

// The supp window calls the following two functions upon open, thinking it
// is being opened by the textbook window.
function AddToHistory() {
	;
}

function CurrentChapter() {
	return 0;
}

function UpdateHistoryLinks() {
	// Mimic ebookAPI's KeepSuppWindowOpen function
	suppwin.banner.document.getElementById('keepopen').style.display = "none";
	suppwin.banner.document.getElementById('backvis').style.display = "none";
	suppwin.banner.document.getElementById('forwardvis').style.display = "none";
	suppwin.banner.document.getElementById('backdim').style.display = "none";
	suppwin.banner.document.getElementById('forwarddim').style.display = "none";
	suppwin.banner.document.getElementById('helpDiv').style.display = "none";
}

function FillinUsername() {
	var cook = document.cookie;
	var pos = cook.indexOf ("lfiofoe=");
	if (pos != -1) {
		var start = pos + 8;
		var end = cook.indexOf (";", start);
		if (end == -1) end = cook.length;
		cook = cook.substring (start, end);
		document.loginForm.username.value = cook;
	}

	// document.loginForm.username.select();
	self.focus();	// Not sure if this is necessary, but got it from http://www.htmlgoodies.com/tabindex.html
	document.loginForm.username.focus()
	
	// Fill in the hidden "start" input with the sent-in value if necessary
	
}

function StoreCookie(name, val) {
	var later = new Date();
	later.setFullYear (later.getFullYear() + 10);
	document.cookie = name + "=" + val + "; path=/; expires=" + later.toGMTString();
}

function ShowError() {
	if (errCode != "") {
		switch (errCode) {
			case 10:
				alert('You must open the eBook through the login screen by specifying a valid username and password. Error code: ' + errCode);
				break;
			case 11:
				alert('You entered an incorrect username and/or password.'); // Enter "Guest" in the username field and leave the password field blank to login as a guest user of the site.');
				break;
			case 13:
				alert('Your account has expired.');
				break;
			case 14:
				alert('You have been automatically logged out of the eBook because someone else has logged in using the same username.  You can only have 1 active session at a time.\n\nNOTE: Attempting to log in with two seperate tabs via same browser can cause this error.');
				break;
			case 15:
				alert('This username is currently blocked from logging in.  The block will be removed in less than one hour.');
				break;
			case 16:
				alert('There was a problem with your account. Error code :16');
				break;
			case 20:
				// User clicked a link to jump to a page, but wasn't logged in.
				alert('Please log in first.  You will then be sent to the requested page in the textbook.');
				break;
			case 99:
				alert('Guest access without a password will not be permitted until December, 2004. If you would like to view the site, please contact Jason Dirks at dirks@sinauer.com');
				break;
			default:
				break;
		}
	}
}