Scriptlet not executed

[M�guel �ngel Mulero Mart�nez]

Hi all!
I�ve seen in a example of the Struts Documentation how to merge scriptlets
with tags. I�ve tried this:

<html:multibox property=�buscoCooperacion.checkAnyoEmpresa"
onclick="marcaMaximoCheckbox(0,, <%=pos%>);�>
   <bean:write name="elementoCreacion" />
</html:multibox>

But the code generated is:
<input type="checkbox" name="buscoCooperacion.checkAnyoEmpresa" value="No
clasifi" onclick="marcaMaximoCheckbox(0,, <%=pos%>);">

So the <%=pos%> is not executed. I�ve tried a lot of things similar to this.
Someone could help me?

Thanks!
Miguel