function isEmail(elm) 
{
    if (elm.value.indexOf("@") == "-1" ||
        elm.value.indexOf(".") == "-1" ||
        elm.value == "")
    return true;
    else return false;
}

function checkData() 

{
	
if (isEmail(document.newsletter.email) == true) 
	{
   	alert("Please enter your eMail address.");
	document.newsletter.email.focus();
  	return false;
  	}
	
return true;
}