[jQuery] passing in an index to a function, then toggle an element based on the index

[jasper]

Hi,
I am invoking a javascript function with an index. Inside the
javascript function, I am constructing the identifier for the element
using the index. For example, if the index is 10, then the class name
of the element is elem-10. Now I need to toggle the display style of
that element. How can I do this?
$("div.elem-"+index).toggle() is not working obviously.
Thanks in advance!