Hi

I am trying to call a web service method from javascript:

function Search() {

        var context = new Object;
        context.Filter = "Test";

        SearchService.GetSearch(context, onSuccess, onFailed);
    }

    function onSuccess(result) {
        // userContext contains symbol passed into method
        var res = document.getElementById("resultsDiv");
        res.innerHTML = result;
    }

    function onFailed(result) {
        var res = document.getElementById("resultsDiv");
        res.innerHTML = result.get_message();
    }

Here's the web service signature:

[WebMethod]
    public SearchComboBoxItemData[] GetSearch(object context)
    {

When I use forms authentication and allow anonymous access to the web service, everything works fine.

However, when I use windows authentication for the application, but only allow anonymous access to the webservice, calling the web service from javascript throws the following error:

Invalid web service call, missing value for parameter: 'context'.

Another thing I noticed is that it works fine both ways in Firefox. I am seeing the error on IE7.

Any thoughts on a possible solution?