Auto Fill 2nd Form Field from 1st info

[homchz]

I want to be able to auto fill the description of an item based on the part number. I know I can do this but have to reload the page each time. Not a problem except I am not sure how to do this without submitting the form, however when I submit the form I want to go to a confirm page.

I could see something like

if (formfield != "")
         {
             reload page
         }

then on the reload a query will seach on the item placing the description in the second field.

But reloading the page before submission is where I am drawing a blank.

Any ideas, or maybe apoint in the right direction?

[homchz]

just saw the post in Coding ablut the zipcode search, which might help, but is Javascript needed to get this done?