Can SOME kind soul help me with this? URGENT

[HELPME]

HI.. can someone pls help me with this.. i am getting trouble in javascript.. and i got a project that need to hand up urgently.....i know about HTML.. but nuts about javascript..any kind soul? i will be glad.. thanks

Main purpose, Find Force and Power Required

Length of cutting = 2*l + 2*w + 2*pie*d [mm]
Shear strength of material = t [N/mm²]

*Shearing force 'F' = length of cutting * t [N]
*Power required = (F * t * n)/60*1000 [W]
Where
't' = thickness of material being sheared [mm]
'n' = Number of strokes per minute
'pie'= 3.142

Material Shear strength [N/mm²]
Steel 40
Aluminium 20
Copper 20

[Ice3T]

problem:
't' is defined 2x
t=Shear strength of material
't' = thickness of material being sheared [mm]

Aren't theses the 3 dimentions of your material being sheared
'l' 'w' 'd' ... if so that seccond 't' should be one of theses

this does not work:
Shearing force 'F' [N]= length of cutting[mm] * t[N/mm²]
because [N] != [N/mm]

Also if I get it you want to be able to enter the variables and the script will give you the result?