Rails - Jun 2006 - can i update the page whitout reload it?

hello everybody
my name is reynaldo

and my question es the next:
i have a form whit a combobox and a textbox
the combobox have the number of days: 1,2,3,4,etc
and i want show in the texbox the result of the number of days for a 
number
for example:
when de user choice 1 day, show in the box $200
when de user choice 2 day, show in the box $400
when de user choice 3 day, show in the box $600
when de user choice 4 day, show in the box $800

is it possible in RoR?

for your help thanks


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javascript

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http://www.amazon.com/gp/product/0596000480/


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