[TYPO3-UG Cambodia] Backend(TCA): decimal number

[May Dara]

Dear TYPO3 Cambodia Group,

In TCA when I configure one textbox:
	"type" => "input",
	"size" => "7",
	"max" => "7",
	"checkbox" => "",
	"eval" => "double2",

and in the ext_table.sql I put that field:
	fieldname decimal(7,2) DEFAULT '0.00' NOT NULL,

In the textbox in BE when I enter:
	3 	show 3.00
	3.5	show 3.50

I don't want like this, I want
	3	show 3 (still the same)
	2	show 2
	2.5	show 2.5 (but they can enter as decimal number)
	4.50	show 4.50

So if you have any solution and clue, please tell.

thank you

May Dara,