get dynamic image text

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C#

ASP.NET

hi all
i have a contactus page which i used acode for protection of Spam in it.
Now , i generate the image with its text and i want to check for the user entered data is identical with the text on the image , but i don't know how to get the text on the image , can any one help me , please???


The Html Image:

<img id="CaptchaImage"  alt="Web Form Code" style="margin-left:20px; border:1px solid #999999" src="http://www.SnapHost.com/captcha/WebForm.aspx?id=FTLT7E9R5EUC&ImgType=2" /></a>
<br />
<a href="#"  önclick="return ReloadCaptchaImage('CaptchaImage');"><span style="font-size:12px;">reload image</span></a>

The Code Of Reload Image:

<script type="text/javascript">

    function ReloadCaptchaImage(captchaImageId) {
        var obj = document.getElementById(captchaImageId);
        var src = obj.src;      
        var date = new Date();
        var pos = src.indexOf('&rad=');
        if (pos >= 0) { src = src.substr(0, pos); }
        obj.src = src + '&rad=' + date.getTime();
        return false;
      
    }
</script>

Thanks