thanks guys... I think i got it my own way
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I have a bean, so I know what the user has selected. If there's an error in the form, I display all the values in the drop down menu, but the first option will be like this
<option checked><%=bean.getSelectetItem()%>
<option> another option </option>
.
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or something like that, i don't have the code in this computer. So he/she can still choose a different option.
The disadvantage is that the option that the user has selected is shown twice. One at the very first option (what the use chose) and the same option where it originally was placed.
I was stuck with this problem for such a long time that didn't see any other solution.
Hope you guys understand what I explained above
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thanks again