// Checks whether a valid contact name has been given i.e. not empty
function checkNewsletter() 
{

var full_name = document.getElementById('fullname').value;
var email = document.getElementById('email').value;

if ((full_name=='Full Name')||(full_name==null)||(full_name=="")){
	alert('Please enter a valid contact name.')
}else{

	if((email=='E-Mail')||(full_name==null)||(full_name=="")){
		('Please enter a valid email addresss.')
	}else{
		
		if (emailcheck(email)==true){
		document.newsletter.submit()
	}
		
	}
}

}

// Checks whether a given string has a valid email format i.e. someone@somewhere.com
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){
		   alert("Please enter a valid email addresss.")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Please enter a valid email addresss.")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Please enter a valid email addresss.")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Please enter a valid email addresss.D")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Please enter a valid email addresss.")
		    return false
		 }

 		 return true					
	}