run a calculate button? and insert address details from a simple dropdown..

[wmguk]

Hey,

 

i have a database that stores all the details about a client.

 

I have a page where people can select the account from a drop down (generated from the database), and I need it to fill the address details out just from this selection. Is there a way to do this?

 

Also I type in a price of goods and I need a way to click a button and get a total from the info i entered?

 

Can anyone point me in the right direction?

[wmguk]

 

This is the form I need to deal with....

 

Any ideas?