I have some text inputs which I'm validating when a user tabs to the next one. I would like the focus to stay on a problematic input after showing an alert. I can't seem to nail down the correct syntax to have JQuery do this. Instead the following code shows the alert then focuses on the next text input. How can I prevent tabbing to the next element after showing an alert?

$('input.IosOverrideTextBox').bind({
    blur: function(e) {
      var val = $(this).val();
      if (val.length == 0) return;
      var pval = parseTicks(val);
      if (isNaN(pval) || pval == 0.0) {            
        alert("Invalid override: " + val);
        return false;
      }
    },
    focus: function() {
      $(this).select();
    }
  });