the code that generates the captcha image oin your page is:
php:
<img id="capt1" src="webassist/captcha/wavt_captchasecurityimages.php?width=150&height=35&field=Security_Code_1&bgcolor=ffffff&transparent=false&bgimage=&gridfreq=0&gridcolor=c7c7c7&gridorder=behind&noisefreq=75&noisecolor=adadad&noiseorder=behind&characters=5&charheight=&font=fonts/MODERNA_.TTF&textcolor=616161" alt="security code" width="150" height="35" /><img align="right" src="webassist/captcha/images/refresh.png" height="18" onclick="document.getElementById('capt1').src+='&ref=1'" style="margin-left:10px;margin-top:15px;" title="Click to regenerate code"/>
this passes a bunch of variables to the wavt_captchasecurityimages.php page. one of them is named "field", in your code it is:
field=Security_Code_1
this is used to set the name of the captcha session as
captcha_<field value>
or in your case:
captcha_Security_Code_1
In the like entry validation, set the server variable to use the Captcha form element and use the captcha_Security_Code_1 session as the comparison
