Add onBlur behavior to SC2 macro

I have some user input data (name, email, phone nr.), that I´d like to validate using an input field's onBlur behaviour.
In HTML, what I am looking for, would look something like this:

<fieldset>
  <label for="email">Email</label>
  <input type="text" name="email" id="email" onblur="validateEmail(value)" />
  <span id="emailError" style="display: none;">You must enter a valid email address</span>
  <label for="Name">Name</label>
  <input type="text" name="name" id="name" onblur="validateName(value)" />
  <span id="nameError" style="display: none;">Please enter your full name.</span>
  <label for="Name">Phone number</label>
  <input type="text" name="phone" id="phone" onblur="validatePhone(value)" />
  <span id="phoneError" style="display: none;">Please provide a valid phone number.</span>
</fieldset> 

Is there a way to put the functions in StoryJavascript and call them from within <<textbox>> macros?