unobstrusive

HTML

<h1>Here's the password</h1>

<input type="password" name="pwpw" id="pwpw"/>
<span name="status">aa</span>

JavaScript

$(document).ready(function(e) {

       function CreateUser() {
			if ( document.getElementsByName("pwpw").value != "" )
                document.getElementsByName("status").innerHTML = "SUX!";
       }
       
       $('#pwpw').on('keyup', CreateUser);
   });