sliding effect not working proplery

Hi,
im new to jqueyr , im using sliding effect in my website
View Demo

here in the box just above to the Designing tip of the week consists of the rows which slides after every 6 seconds. problem is the way they slide it is nt as expected. cant explain more in detail . one can understand only after viewing the page.

Thanks in advance!

Regards,
Sangeeta J Singh