How to pass values from jquery uplodify() method to handler

I wrote the code like this:

var dependentid;
$(document).ready(function () {
        var empNo = "<%=empNo%>";
        $("#file_upload").uploadify({
           uploader: uploadify.swf,
            cancelImg: ../../images/cancel.png,
            buttonText: Browse&,
           uploader: ../../handlers/Upload.ashx,
            formData: { dependentid: $(#hrForms_phContent_txtDependentid).val() },
            folder: uploads,
            fileDesc: Image Files,
            fileExt: *.jpg;*.jpeg;*.gif;*.png,
            multi: true,
            auto: false,
            debug: false
        });

    });
Here dependentid is going NULL or Empty in handler class.
Handler.ashx code:

empNo = context.Request["empNo"];
            dependentid = context.Request["dependentid"];

Plz help me how to pass values from Uploadify() method to handler class

thanks
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