captcha user control

actually first am create a usercontrol for captcha and drag and drop the user control in my page but when page post back the image become change but the text enterd below that text as usual in the textbox


but dontworry i solved this problem by creating anothe aspx page and write the code for captcha image.and from another page i just take a html image and text box and just call image src=which page i have written the captcha code(captcha.aspx) and i got the actual result