reflection of combo box values from one to another.

[neetu]

hi if anyone could help me it would be great
i hv an asp page which has a combo box
depending on the options chosen in the combo box ....it should refresh or reload the page & display another combo box by the side of it with a set of values

ex:
the 1st combo box values could be
1.fruits
2.vegetables
3.drinks

the 2nd combo box value depending on the 1st one could be
for fruits :
1.apple
2.grapes
3.banana

for vegge :
1.carrot
2.radish
3.beetroot

for drinks :
1.coke
2.pepsi
3.tea

& so on

iam using asp for this & depending on the option chosen in the 1st combo box....i call onchange in it & in the javascript code ...i think i can use window.location & reload the page but how i do this retaining the old values & accepting new values

if u can help me with this itll be great
thnx