<input type="button" name="cmdUpdate" onclick="selFrame.frmMain.submit()">
==>
<input type="button" name="cmdUpdate" onclick="selFrame.frmMain.onsubmit()">
==>
<input type="button" name="cmdUpdate" onclick="selFrame.frmMain.onsubmit()">
所以上面的程序改为:onsubmit()