how to display a popup window in center

i have this code and want to display popup window in center.  How do i do that

& "function PrintChecks()" & vbCrlf _
& "{" & vbCrlf _
& """newwin"";" & vbCrlf _
& " var a =""OptionFunction.asp?MI=8&SMI=8&Draw_Report=8&INITIAL_REQUEST=TRUE"", ""newwin"", ""width=20, height=20,"")" & vbCrlf _
& "document.FrmCheckShow.submit();" & vbCrlf _
& "}" & vbCrlf _
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<script language="javascript">
      window.resizeTo(20, 20);
      window.moveTo(screen.availwidth / 2 - 20, screen.availheight / 2 - 20);


var a =""OptionFunction.asp?MI=8&SMI=8&Draw_Report=8&INITIAL_REQUEST=TRUE"", ""newwin"", ""width=20, height=20, left=screen.availwidth / 2 - 20, top=screen.availheight / 2 - 20"")"


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princeofemAuthor Commented:
how to i change to center or bottom?
prince - look at the code Kaenguru gave you. Think a little. Do a little math.
princeofemAuthor Commented:
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