using setTimeout when using prototype

I have an object, and I define the following:
var processForm=new Object();

processForm=function(inservleturl) {
        this.inservleturl = inservleturl;
        this.submitForm();
}

        processForm.prototype.submitForm2=function() {
        }

        processForm.prototype.submitForm=function() {
               setTimeout("submitStep2()", 20);
        }

How can the submitForm function's setTimeout call submitStep2?

Thank you.
Received on Tue Feb 7 21:28:58 2006