var title = 0;
var surname = "";
var email = "";
var errorTitle = "Please select your title.";
var errorName = "Please enter your surname.";
var erroremail = "Please enter your email address.";
var invalidAddress = "Please enter valid email address.\nAddress has to be written as shown in the following: name@domain.com";

function setTitleIndex(selectElement)	{
	title = selectElement.selectedIndex;
}

function checkAddress()	{
var atIndex = email.indexOf("@");
var dotIndex = email.lastIndexOf(".");
var atIndexPlus = atIndex + 2;
var emailLength = email.length - 1;
	if (atIndex < 1) { // @ cannot be at the start of the string
		return false;
	}
	if (dotIndex < atIndexPlus) { // . cannot be immediatly after @
		return false;
	}
	if (dotIndex == emailLength)	{
		return false;
	}
	else {
		return true;
	}
}

function checkSignup()		{
surname = document.sendmail.surname.value;
email = document.sendmail.email.value;
	if (title == 0)	{
		alert(errorTitle);
		return false;
	}
	if (!surname || surname == "Nachname")	{
		alert(errorName);
		document.sendmail.surname.focus();
		return false;
	}
	else if (!email || email == "E-Mail")	{
		alert(erroremail);
		document.sendmail.email.focus();
		return false;
	}
	else if (!checkAddress())	{
		alert(invalidAddress);
		return false;
	}
	else	{
		document.sendmail.submit();
	}
}

function enterSubmit()	{
	if(window.event && window.event.keyCode == 13) {
		checkSignup();
		return !(window.event && window.event.keyCode == 13);
	}
	else	{
  		return true;
	}
}