Passing Object Literal to Javascript method ?

Please some help on the following.

How to pass an Object literal to a javascript function

I have a javascript function that looks like:

public final native CssHolder perform(Element element, int duration) /*-{

return $wnd.CssMod.perform(element, {opacity: 0.2}); 

}-*/;

This works if I call it from java code.

How can I pass in the Object literal "{opacity: 0.2}" as argument in the above?

So I want something like:

public final native CssHolder  perform(Element element, int duration, Object args) /*-{

return $wnd.CssMod.perform(element, args); 

}-*/;

But what should "args" be ?

I tried to pass in a json data string and eval() it, like 

return $wnd.CssMod.perform(element, eval(args)); 

Or pass in a json string like:

perform(button, 3, "[ \"opacity\" : \"0.2\" ]"

etc...

But it all results in some strange Javascript error :(..

- Ed

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