how to exclude a value in a filter ?

Hello all,

Does anyone know how to exclude a value in a filter in a simple search?

In advanced search I would select the operation "not like". But I have to use it in a javascript methode where a simple search is used. To set a value in the filter I use the following code:
var Filter=new Object();
Filter["state"]={filterValue:"Released",isFilterFixed:true};
return Filter;

But how can I set the filter to show all states but e.g. "Released"?

Thanks for your help.