function validate() {

    var nameField =  document.forms["capture_form"].name.value;
    var emailField =  document.forms["capture_form"].email.value;
    var telephoneField =  document.forms["capture_form"].telephone.value;

    if( nameField.length == 0 ){
      alert("Please enter your name!");
      return false;
    }

    if( emailField.length == 0 ){
      alert("Please enter your email address!");
      return false;
    }

    if( telephoneField.length == 0 ){
      alert("Please enter your telephone number!");
      return false;
    }

    if( telephoneField.length < 9 ){
      alert("Please enter your full telephone number including area code!");
      return false;
    }

    document.forms["capture_form"].submit();

  }//end validate