javascript form, drop down box

[itrends]

can someone please help me( i guess thats why you are reading? hehe)
erm, i have this form all working except for one thing

http://www.dynamic-webs.co.uk/davio/jform.htm

the drop down box i have on there with the delivery option.
I want it to update the delivery text box with the required ammount when either option is selcted

eg
select £10 the delivery box displays £10
but it must also add up the stuff int eh total.
take a look to see what i mean, other than that everyhting else is working.

Please help

Dave

 

[Nsynan]

I'm not saying this is your answer, but the following script may have some of the logic you require to do what you're looking for:

http://javascript.internet.com/calculators/best-price.html

 

[itrends]

hehe
thanks, but thats not quite what i am after. i have forms with the logic in ( i think) but dont know how to implament it to anything other than a text box that the user edits.
I am guesing that the drop down just has to set a value number? but as i said, i dont know how to implament it. if someone could help me that would be great


thanks 4 ur time
Dave