// JavaScript Document

function validate_newsletter()
{
	if (document.newsletter_signup.name.value == null || document.newsletter_signup.fname.value == 'name') {
		alert('Name field cannot be blank');
		document.newsletter_signup.name.focus();
		return false;
	}
	
	else if (document.newsletter_signup.fname.value == null || document.newsletter_signup.fname.value == 'first name') {
		alert('First name field cannot be blank');
		document.newsletter_signup.fname.focus();
		return false;
	}
	
	else if (document.newsletter_signup.lname.value == null || document.newsletter_signup.lname.value == 'last name') {
		alert('Surname field cannot be blank');
		document.newsletter_signup.lname.focus();
		return false;
	}
	
	//else if (document.newsletter_signup.email.value == null || document.newsletter_signup.email.value == document.newsletter_signup.email.alt.value) //Test this
	else if (document.newsletter_signup.email.value == null || document.newsletter_signup.email.value == 'email address')	{
		alert('email field cannot be blank');
		document.newsletter_signup.email.focus();
		return false;
	}	
	
	else if (emailCheck(document.newsletter_signup.email.value) == false) {
		alert("You did not enter a valid email address");
		document.newsletter_signup.email.value = "";
		document.newsletter_signup.email.focus();
		return false;
	}
	
	return true;
}

function emailCheck(str) {
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	
	if (str.indexOf(at)==-1){return false;}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){return false;}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){return false;}
	if (str.indexOf(at,(lat+1))!=-1){return false;}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){return false;}
	if (str.indexOf(dot,(lat+2))==-1){return false;}
	if (str.indexOf(" ")!=-1){return false;}
	
	return true;		
}