title: s:url taking all the params even param name is different
body: <p>Hi I am using <code>s:url</code> tag for making a url, I need it to paginate my jsp to several pages.<br/>
  So I need to send next or previous when we click on next or previous link. But when I click on Previous it shows me url on address bar like <code>someAction?previuos=prev</code> then I click on Next it displays <code>someAction?previuos=prev&amp;Next=Next</code> when I only need <code>someAction?Next=Next</code>.<br/></p>
  
  <p>I have given different names to the url as for Previous link <code>&lt;s:url name="urlPrev"&gt;</code> and for next <code>&lt;s:url name="urlNext"&gt;</code></p>
  
  <p>I don't how to differentiate them. What is wrong in my code?</p>