html form submission at runtime in c#

hi experts,

In my .net c# page button submit i m creating an html form object and using the following code to submit it and upon submission the user is taken to another website. After the button click post back when the javascript is still  submitting the form created at runtime, the user sees the same page like nothing has happened on form submission as javascript takes few extra seconds to redirect to that page. Some times the user presses the submit button again to make sure successfulll form submission. How can we possibly resolve this issue

private void PayPalPostScript(System.Web.UI.Page Page)
        //This registers Javascript to the page which is used to post the PayPal Form details
        StringBuilder strScript = new StringBuilder();
        strScript.Append("<script language='javascript'>");
        strScript.Append("var ctlForm = document.getElementById('frmPP');");
        Page.ClientScript.RegisterStartupScript(this.GetType(), "PPSubmit", strScript.ToString());
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I would recommend disabling the submit button so they don't click it again.

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