WebBroswser Control and Submit

[sebbs]

I am implementing off-line ASP supporting browser. I use MS WebBrowser control. I got everything to work except handling submit requests from script. For example:
<SCRIPT language="JavaScript">

function ReloadPage()
{
if (InvalidateOutput())
{
document.forms[0].action="area1.asp";
document.forms[0].submit();
}
}
</SCRIPT>
...
<SELECT name=numericin3Unit onchange="ReloadPage()">
<%=uc.GetUnitsListHTML(hhnumericin3Unit,"Length")%>
</SELECT>
...