how can make a big icon??

i'm using hi res screen 800x480. i have standart menu that can call so many program. but i feel the button is to small for that resolution. so i tried to make my own button. i think big button will more confortable to operate.
i want 140px x 140px each button size, so i make jpeg first with that pixel size. after finished, i open icoFX6 and then click " making for windows". after finished my ico file can be used.
but my problem is, why the *.ico that i was make, still small ( like the standart size ). could anyone help?

Might be easier to use the bmp and change the section to BITMAPBUTTON from ICONXPBUTTON

Fatboyfun wrote:Might be easier to use the bmp and change the section to BITMAPBUTTON from ICONXPBUTTON

Agreed. 140x140 is not a "standard" size for a Windows icon--particularly XP, so when clicking to convert for Windows (*.ico) in your graphics program, it probably reduces it.