unstabledreamer

So i am using Oscommerce and i just installed an application to do a discount for my customers. If you are familiar with oscommerce the application was easy discount. I need two tiny peices of php code i cannot write php but i can put it in english. First i need to have this peice of code that says ( if order total before tax and shipping is applied is greater than 150.00 then minus 25.00 off total orde then add tax ad shipping) if tax and shipping is a problem it doesnt matter Second i need one with a code that says ( if code value equal true then minus 10% from total order) any help would be great thank you.