How to overwrite the value of a struts variable value using struts only

Say i define a variable using struts in my jsp

<bean:define id="aVar" value="abc" />

Now the variable has a value of abc , how can i overwrite it again to have another value --say "123"..

I need to change its value using struts only and not scriplet.

Kindly help ....

[304 byte] By [miniscreena] at [2007-11-27 5:19:42]