>thanks,

you're welcome

>but i need somthing else as subtract the first 2000 at step1,subtract 4000 at second .....etc,e.i if mynumber after the 2 steps is=0 sum n1+n2,if mynumber after 3 steps=0 sum n1+n2+n3....

Well, maybe I didn't got you fine.. Can you be a little more "procedural".. Taking step-by-step..

if  thisform.text1.value =< 2000
    thisform.text2.value      = 2000 - (thisform.text1.value * 0.05)
else
    if  thisform.text1.value =< 30000
        n1          = 2000*0.05 && mean 100
        &&& i mean now 30000-2000
        n2          = 4000*0.10 && mean 400
        &&& 28000-4000
        n3          = 8000*0.20 && mean 1600
        &&&&24000-8000
        n4          = 16000*0.25 && mean 4000
        thisform.text2.value   = iif((n1+n2+n3+n4)>0,4000 - (n1 + n2 + n3 + n4), n1 + n2 + n3 + n4)
    else
        * your number is greaterthan 30000
    endif
endif