function validate(form_id,email) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.main_form.email_address.value;
   if(reg.test(address) == false) {
      alert('Please enter a valid Email Address');
      return false;
   }else{
      alert ("Thank You for signing-up for the latest Waterhawks updates"); 
   }
}

function alertUpdate() {
    var agree=confirm("Are you sure you wish to continue?");
    if (agree){
        return true ;
    }else{
        return false ;
    }
}