title: Change text on hover, then return to the previous text
body: <p>I have a system of comments, and each comment has a button that normally displays the number of replies to it. I want that when a user hovers over the button, the text changes from "3 replies" to "Reply!", and then, when the mouse leaves the button, the text returns to "3 replies".</p>
  
  <p>Because the number of replies varies for each comment, I cannot do a simple mouseover/mouseout script. One way to go around it would be to pass the number of replies as a variable, and make a small function to take care of it. But there must be a simpler way. I tried using the :hover thing in css to change the content of the tag (with the css property content), but no luck yet.</p>
  
  <p>Any help appreciated, thanks!</p>