317801 Javascript Slider

Hello, I have a HTML form (its a signup form in php smarty) its a signup form for my social network website. I need a javascript slider script, so when the person hits "signup" it will show another portion of the signup script, so it splits the html form in half, so i can show my captcha, then they hit signup again and it signs them up. the form is fully functional this is purely javascript and minor html work.