Shopping cart library and input field formating

[eluser]tmengttm[/eluser]
Hi all,

Update:

Previously, i was asking: is there a way to extend/modify ci shopping cart library to make "qty" accept double value. Because it seemed to me that "qty" only accepts integer value. thanks jmadsen, the problem is solved. It turns out that I just need to change the code in system/library/cart file...

Now my questions is:

Is there a way to format input field in such a way: a number with 1 decimal place?