ฟังชั่นไม่ทำงาน จะแก้อย่างไง ช่วยดูให้หน่อยคาบ ตรงอักษรภาพ ฟังชั่นไม่ทำงานไม่รู้เรียกใช้ผิดตรงไหน ช่วยดูให้หน่อยคาบ

//START FORM
function chk_wordpic(field){
	var objmsg=rq_objmsg('div_wordpic');
	var txt_field = field.value;
	var txt_length = txt_field.length;
	if (txt_length == 0 || txt_field == null){
		objmsg.innerHTML = 'Type Text Picture (ใส่อักษรภาพ)';
		objmsg.style.color="#000000";
		rq_objmsg('img_wordpic').style.display = "none";
		rq_objmsg('img_wordpicx').style.display = "none";
		return true
	}else{
		if(txt_length == 5){
			var txt_wordpic = getCookie('register','wordpic');
			with (field){
				if (field.value != txt_wordpic){
					objmsg.innerHTML = 'Code Is Wrong ! (อักษรภาพ ไม่ถูกต้อง)';
					objmsg.style.color="#ff0000";
					rq_objmsg('img_wordpic').style.display = "none";
					rq_objmsg('img_wordpicx').style.display = "block";
					setTimeout("chg_wordpic()",1000);
					return false;
				}else {
					objmsg.innerHTML = 'Code Is Correct ! (อักษรภาพ ถูกต้อง)';
					objmsg.style.color="#006633";
					rq_objmsg('img_wordpic').style.display = "block";
					rq_objmsg('img_wordpicx').style.display = "none";
					return true;
				}
			}
		}else{
			objmsg.innerHTML = 'Type Text Picture (ใส่อักษรภาพ)';
			objmsg.style.color="#000000";
			rq_objmsg('img_wordpic').style.display = "none";
			rq_objmsg('img_wordpicx').style.display = "none";
			return false;
		}
	}
}

function chg_wordpic(){
	rq_page('http://'+jweb+'/_include/randompic.asp','','','div_randpic');
	var objmsg=rq_objmsg('div_wordpic');
	objmsg.innerHTML = 'Type Text Picture (ใส่อักษรภาพ)';
	objmsg.style.color="#000000";
	rq_objmsg('img_wordpic').style.display = "none";
	rq_objmsg('img_wordpicx').style.display = "none";
	var objmsg=rq_objmsg('wordpic');
	objmsg.value=""
	objmsg.focus();	
}
//END FORM


=======================================================

<form action="http://<%=SERVER_NAME%>/_include/add_register.asp" method="post" target="ifrm0" name="myform" onSubmit="return validate_form(this)">
<div class="txtbox">
<table width="500" border="0" align="center" cellpadding="2" cellspacing="2" bgcolor="#c0c0c0">
  <tr>
    <td align="right">&nbsp;</td>
    <td width="330" align="left">&nbsp;</td>
  </tr>
    <tr>
    <td align="right">name :<br>
    ชื่อผู้ใช้ : </td>
    <td align="left">
     <img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_username" height="20" align="right" id="img_username" style="display:none" />
     <img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_usernamex" height="20" align="right" id="img_usernamex" style="display:none" />
     <input name="username" type="text" id="username" value="<%=Request.Cookies("register")("username")%>" size="10" onKeyUp="chk_username(this)" onBlur="chk_username(this)"><br>
	  <div id="div_username" align="left" style="font-size:10px;">Type UserName (พิมพ์ UserName)</div>
    </td>
  </tr>

  <tr>
    <td align="right">password :<br>
    รหัสผ่าน : </td>
    <td align="left">
     <img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_passw" height="20" align="right" id="img_passw" style="display:none" />
     <img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_passwx" height="20" align="right" id="img_passwx" style="display:none" />
      <input name="passw" type="password" id="passw" value="<%=Request.Cookies("register")("passw")%>" size="10" onKeyUp="clr_password('passw2')" onBlur="rq_objmsg('passw_code').value=ajax('http://<%=SERVER_NAME%>/_asp/ApiEncodePassword.aspx','' ,'password='+this.value);rq_objmsg('code').value=ajax('http://<%=SERVER_NAME%>/_asp/ApiEncodePassword.aspx','' ,'password='+rq_objmsg('username').value+this.value);">
    </td>
  </tr>

  <tr>
    <td align="right">conferm password :<br>
      รหัสผ่านอีกครั้ง: </td>
    <td align="left">
     <img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_passw2" height="20" align="right" id="img_passw2" style="display:none" /><img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_passw2x" height="20" align="right" id="img_passw2x" style="display:none" />
      <input name="passw2" type="password" id="passw2" value="<%=Request.Cookies("register")("passw2")%>" size="10" onBlur="chk_equal('passw','passw2')" onKeyDown="clr_chkPassword()"><div id="div_passw" align="left" style="font-size:10px;"></div></td>
  </tr>
  <tr>
    <td align="right">e-mail :<br>
    อี-เมล์ : </td>
    <td align="left">
	 <img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_passw" height="20" align="right" id="img_passw" style="display:none" />
     <img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_passwx" height="20" align="right" id="img_passwx" style="display:none" />
      <input name="email" type="text" id="email" value="<%=Request.Cookies("register")("email")%>" size="20" onBlur="chk_email(this)"><div id="div_email" align="left" style="font-size:10px;"></div></td>
  </tr>
  <tr>
    <td align="right">gender :<br>
    เพศ : </td>
    <td align="left">

    <input name="gender" type="radio" value="m" <%IF Request.Cookies("register")("gender") = "" OR Request.Cookies("register")("gender") = "m" THEN%>checked<%END IF%> style='width:30px;'>
      male
        <input name="gender" type="radio" value="f" <%IF Request.Cookies("register")("gender") = "f" THEN%>checked<%END IF%> style='width:30px;'>
    female

    </td>
  </tr>
  <tr >
    <td align="right">Phone number :<br>
   หมายเลยโทรศัพท์: </td>
    <td align="left">
	 <img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_passw" height="20" align="right" id="img_passw" style="display:none" />
     <img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_passwx" height="20" align="right" id="img_passwx" style="display:none" />
      <input name="numtel" type="text" id="numtel" value="<%=Request.Cookies("register")("numtel")%>" size="13" maxlength="13"></td>
  </tr>
  <tr>
    <td align="right"><div id="div_randpic"></div></td>
    <td align="left"><img src="http://<%=SERVER_NAME%>/images/gif/mark.gif" name="img_wordpic" height="20" align="right" id="img_wordpic" style="display:none" /><img src="http://<%=SERVER_NAME%>/images/gif/x.gif" name="img_wordpicx" height="20" align="right" id="img_wordpicx" style="display:none" />
      <input name="wordpic" type="text" id="wordpic" onKeyUp="chk_wordpic(this)" size="5" maxlength="5" autocomplete="off">
    <div id="div_wordpic" align="left" style="font-size:10px;">Type Text Picture (ใส่อักษรภาพ)</div></td>
  </tr>
  <tr>
    <td align="right" valign="top"><span style="cursor:pointer; color:#FFFFFF; font-size:12px; display:;" onClick="chg_wordpic()">change picture</span></td>
    <td align="left"><input type="Submit" name="Submit" value="Submit" style="cursor: pointer;width:100px; background-color:#000000; color:#FFFFFF; font-weight: bold;">
      <input name="ctr" type="hidden" id="ctr" value="<%=ctr%>" />
      <input name="passw_code" type="hidden" id="passw_code" />
      <input name="code" type="hidden" id="code" value="<%=Request.Cookies("register")("code")%>" /></td>
  </tr>
  <tr>
    <td align="right" valign="top">&nbsp;</td>
    <td align="left">&nbsp;</td>
  </tr>
</table>
</div>
</form>