$(document).ready(function() {

function my_callback(value) {
  value = value.replace(/\s/g, '');
  if (value) {
    $('.prevactionY').css('display','block');
  } else {
  // no prev action, show that block
    $('.prevactionN').css('display','block');
  }

}

spud_get({field: "email", callback: my_callback});

});