if(jQuery("#doctor").length == 0) {
//it doesn't exist
}
else {
    jQuery("#email-dr").val('some@email.com');
//select drop down menu on change

jQuery("#doctor").change(function() {
  this.options[this.selectedIndex].value;
  var strUser = this.selectedIndex;
  console.log('strUser: ' + strUser);
  //insert value into hidden #email-dr
  if (strUser == "2") {
    //yeo
    jQuery("#email-dr").val('another@email.com');
    jQuery("#email-cc").val('some@email.com');
}
else {
    jQuery("#email-dr").val('some@email.com');
    jQuery("#email-cc").val('');
}
});

}