How can I cancel registerstartupscript?

There is such a problem
The page is divided into three sections: [Div] ABC,
1. Start to display a. After the customer clicks the button
Go to the B [Wait page]. I used it here.
String autosubmit = "<script language = 'javascript '> setTimeout ('document. Forms [0]. Submit ();', 3000); </SCRIPT> ";
This. Page. registerstartupscript ("myzerg", autosubmit );
To make the page automatically submit ---> submit to C
But at the time of C, it seems that the registerstartupscript is still working. How can I cancel it?
Please kindly advise