how to write a function like (set! x y) ?

Hi!
I'm sorry if this has been asked before, but I'm new to scheme, and a search on google didn't yield any results, nor in this newsgroup (although I'm not too good at searching newsgroups) ...

I want to program a function (test x y) that acts like (set! x), so that if I enter
(test a 7)
It sets a to the value of 7.
At first I tried to write the following:
(define (test x y)
(set! x y))
which obviously did not work, because it sets _x_ to y and not the symbol-name contained in x...

Then I had the idea that I could write a function (return a) that returns the value of x, in this case a symbol, and subsitute x in the function with (return x):

(define (test x y)
	(define (return a) a)
	(set! (return x) y))

This didn't work either, it says:
"set!: not an identifier in: (return x)"

Does anyone have any suggestions on how I can write the function?
Thanks for any help.
/Abraha
.

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