function valid_email(e)
{
	if ((e.replace(" ","").length==0)||(e.lastIndexOf("@")==-1 || e.lastIndexOf(".")==-1)) 
	{
		return false;
	}
        else  return true;
}

function valid( f ) 
{
	if( f.emailField.value.length == 0 || !valid_email( f.emailField.value )) 
	{
       alert( "Please, type in your e-mail address correctly. This will be used if you want us to contact you." );
       f.emailField.focus();
       return false;
    }
    return true;
}

function sendNewsLetter( f ) 
{
    if( valid( f )) 
	{
       f.submit();
	}
}