sto implementando un CAPTCHA e più precisamente il bellissimo http://www.tipstricks.org

ora la pagina chge sto facendo è questa:

http://www.iltrogolo.it/attila/coins/traders/post01.asp

problema: come faccio a far si che possa avere un tasto solo che contemporaneamente controlli e il CAPTCHA e se corretto infii il form?

il codice che sto usando è questo:
perdonate la confusione nel codice la parte in questione sta in fondo...

grazie a chiunque mi possa aiutare...

codice:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="1254"%>

<%
Response.CacheControl = "no-cache"
Response.AddHeader "Pragma", "no-cache"
Response.Expires = -1
%>
<%
Function CheckCAPTCHA(valCAPTCHA)
	SessionCAPTCHA = Trim(Session("CAPTCHA"))
	Session("CAPTCHA") = vbNullString
	if Len(SessionCAPTCHA) < 1 then
        CheckCAPTCHA = False
        exit function
    end if
	if CStr(SessionCAPTCHA) = CStr(valCAPTCHA) then
	    CheckCAPTCHA = True
	else
	    CheckCAPTCHA = False
	end if
End Function
%>


<%
If Request("Post")<>"" Then
	OpenDB con, "GuestBook"
	
	'--- determin browser and IP--------------	
	If Instr(Request.ServerVariables("HTTP_USER_AGENT"), "MSIE") Then
		browser = "MSIE"
	Elseif Instr(Request.ServerVariables("HTTP_USER_AGENT"), "Mozilla") Then
		browser = "Netscape"
	Else
		browser = "Other"
	End If
	
	IP = Request.ServerVariables("Remote_Addr")
	'---- end --------------------------------
	
	SQL = "INSERT INTO tblGuestbook (fldName, fldCity, fldState, fldCountry, fldRefer, fldMessage, fldEmail, fldHomepage, fldBrowser, fldIP, fldTime, fldDate) VALUES ('" & _
InsertAP(Trim(Request("Name"))) & _
"','" & InsertAP(Trim(Request("City"))) & _
"','" & InsertAP(Trim(Request("State"))) & _
"','" & InsertAP(Trim(Request("Country"))) & _
"','" & Request("Refer") & _
"','" & InsertAP(Trim(Request("Message"))) & _
"','" & InsertAP(Trim(Request("Email"))) & _
"','" & InsertAP(Trim(Request("Homepage"))) & _
"','" & browser & _
"','" & IP & _
"',#" & Time() & _
"#,#" & Date() & "#)"
	con.execute(SQL)
	response.redirect "default.asp"
End If
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<HTML>
<HEAD>


<script language="javascript">
var text1;
function checklength(i)
{
var txt;
txt=document.frmPost.Message.value;
n=txt.length;
if (n>i) //i is the maxlength of textarea which we have set to 80
{
alert('Text overflow');
document.frmPost.Message.value=text1;
return;
}
text1=document.frmPost.Message.value;
}
</script>

<script language="javascript">
var text2;
function checklength2(i)
{
var txt3;
txt3=document.frmPost.Homepage.value;
n=txt3.length;
if (n>i) //i is the maxlength of textarea which we have set to 80
{
alert('Text overflow');
document.frmPost.Homepage.value=text2;
return;
}
text2=document.frmPost.Homepage.value;
}
</script>









	<TITLE>POST A MESSAGE</TITLE>
<script LANGUAGE="JavaScript">
	<!-- HIDE FROM OTHER BROWSERS
	function validate(theForm) {

	if (theForm.Name.value == "")
  	{
    alert("Name required. Thank you.");
    theForm.Name.focus();
    return (false);
  	}
	if (theForm.Email.value == "")
  	{
    alert("Email address required. Thank you.");
    theForm.Email.focus();
    return (false);
  	}
	if (theForm.Message.value == "")
  	{
    alert("Message required. Thank you.");
    theForm.Message.focus();
    return (false);
  	}

if (theForm.Message.value.length > "800")
  	{
    alert("Message exceded size. Thank you.");
    theForm.Message.focus();
    return (false);
  	}




	return (true);
  }
	// STOP HIDING FROM OTHER BROWSERS -->
    </script>
</HEAD>

<BODY bgcolor="#c6c1ff" onload="document.frmPost.Name.focus()" >
<dir><dir>
<form action="post01.asp" method="post" onsubmit="return validate(this);"  name="frmPost">
<table border="2" cellpadding="0" cellspacing="0" bgcolor="#c6c1ff">
<tr>
	<td align="center" colspan="2"><font face=Verdana,Arial size=3>POST A MESSAGE</font></td>
</tr>
<tr>
	<td><font face="TREBUCHET MS,ARIAL,HELVETICA" size="2">Name:</font></td>
	<td><input type="text" name="Name" size="20"></td>
</tr>
<tr>
	<td></td>
	<td></td>
</tr>
<tr>
	<td></td>
	<td></td>
</tr>
<tr>
	<td><font face="TREBUCHET MS,ARIAL,HELVETICA" size="2">Country:</font></td>
	<td><select size="1" name="Country">
                <option selected>Country....</option>
                <OPTION>AFGHANISTAN </OPTION>
                <OPTION>ALBANIA </OPTION>
                <OPTION>ALGERIA </OPTION>
                

<OPTION>VANUATU </OPTION>
                <OPTION>VATICAN CITY STATE (HOLY SEE) </OPTION>
                <OPTION>VENEZUELA </OPTION>
                <OPTION>VIETNAM </OPTION>
                <OPTION>VIRGIN ISLANDS (BRITISH) </OPTION>
                <OPTION>VIRGIN ISLANDS (US) </OPTION>
                <OPTION>WALLIS AND FUTUNA ISLANDS </OPTION>
                <OPTION>WESTERN SAHARA </OPTION>
                <OPTION>YEMEN </OPTION>
                <OPTION>YUGOSLAVIA </OPTION>
                <OPTION>ZAMBIA </OPTION>
                <OPTION>ZIMBABWE</OPTION>

    </select></td>
</tr>
<tr>
	<td><font face="TREBUCHET MS,ARIAL,HELVETICA" size="2">Email:</font></td>
	<td><input type="text" name="Email" size="20"></td>
</tr>
<tr>
	<td><font face="TREBUCHET MS,ARIAL,HELVETICA" size="2">Homepage:</font></td>
	<td><input type="text" name="Homepage" onkeydown="javascript:checklength2(100)" value="http://" size="20"></td>
</tr>
<tr>
	<td></td>
	<td></td>
</tr>
<tr>
	<td colspan="2"><font face="TREBUCHET MS,ARIAL,HELVETICA" size="2">Message:</font>

	<textarea name="Message" onkeydown="javascript:checklength(800)" rows="6" cols="40" wrap="virtual"></textarea></td>
</tr>










<tr>
      <td width="152" height="32">CAPTCHA Image</td>
      <td width="182">[img]aspcaptcha.asp[/img]</td>
    </tr>
<%
if Request.ServerVariables("REQUEST_METHOD") = "POST" then
	strCAPTCHA = Trim(Request.Form("strCAPTCHA"))
	if CheckCAPTCHA(strCAPTCHA) = true then
		%>
    <tr>
      <td height="37" colspan="2" align="center"><b style="color:#00CC00">Verified (<%=strCAPTCHA%>)[/b]</td>
    </tr>		
		<%
	else
		%>
    <tr>
      <td height="37" colspan="2" align="center"><b style="color:#FF0000">Not Verified.
Please Retry.[/b]</td>
    </tr>
		<%
	end if 
end if
%>
    <tr>
      <td height="66">Write the characters in the image above</td>
      <td><input name="strCAPTCHA" type="text" id="strCAPTCHA" maxlength="8" /></td>
    </tr>
    <tr>
      <td height="37" colspan="2" align="center"><input type="submit" name="Submit" value="Test Input" /></td>
    </tr>
    <tr>
      <td height="37" colspan="2" align="center">Download v2.0 Example</td>
    </tr>








<tr>
	<td align="center" colspan="2"><input type="submit" name="Post" value="Post Now"></td>
</tr>
</table>
</form>
</dir></dir>
</BODY>
</HTML>