Download or display captcha from a website

I am trying to save a captcha image from a website using vb6.

I tried doing it using some what like shown in this page .But the problem is that captcha saved is not the actual captcha which is displayed. Everytime wrong captcha was downloading.

Then i tried using URLDownloadToFile function to download the captch. But no luck for me.

So i want to know how can i save the captcha properly So that i can add it in my own control in my application.

Waiting for your replies