opening applet from applet

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Java

HI, I have created an application in netbeans , now I want to open one applet from another . But I am getting error in line:

getAppletContext().showDocument()

my code is :

try
{
    AppletContext a = getAppletContext();
    URL u = new URL("surbhi1.html");
    a.showDocument(u,"_self");
}
catch (Exception e)
{
    System.out.println(e.getMessage());
}

Please any one have any option for this then please tell me.