This subpage includes the great JQuery plugin Formalize by Nathan Smith. Visit the website to find out what it does and see the demos! You don´t have to use a table as shown here (this is just an example), you can build your form without tables, too. Inspect the CSS to utilize the classes that fit your needs.
Comment or delete the section "Forms" in inuit.css when you make use of Formalize so the styles won´t interfere.