<FORM name=myform1 METHOD=POST ACTION=spavkared.php target=main> 
  <FORM name=myform METHOD=POST ACTION=spavkared.php target=frm> 

  <INPUT TYPE="hidden" NAME="kod" SIZE="8" MAXLENGTH="30">				   	     <!-- счетчик -->
  <INPUT TYPE="hidden"  NAME="idd" SIZE="8" MAXLENGTH="30" value="<?=$id?>">              <!-- скрытое поле идентификатор-->

<input type="submit"  name="sox4" Value="Сохранить1" onclick="CreateNewWindow()"> 
<input type="submit"  name="sox3" Value="Сохранить2" > 
</form></form>

function CreateNewWindow() {
 Win =window.open('soxrsp.php?idd=document.myform.idd.value', 'frm', 'width=400, height=100 scrollbars resize');
 myform.submit();
 document.myForm1.sox3.click()
}

<input type="submit"  name="sox2" Value="Сохранить" onclick="myform.action='soxrsp.php'; window.open('', 'frm', 'width=400, height=100 scrollbars resize'); myform.submit();">

<input type="submit"  name="sox3" Value="Сохранить2" >

function CreateNewWindow() {
 Win =window.open('soxrsp.php?idd=document.myform.idd.value', 'frm', 'width=400, height=100 scrollbars resize');
 myform.submit();
 document.myForm1.sox3.click()
}