label cck hide input form

Hi everybody,

I have a problem with the display of labels of cck fields.
I would like to not display them in input forms.
In fact, in a form, I have a lot of CCK fields and their names are complicated like xxx_xxx_xxx so for my users, in the input form, they'll see these labels to fill their fields which it's not very nice.

For the output, there's no problem because I can theme them.

But for the input form I don't know how to do this.