Stuck on a few problems with iMacros

I'm still very much on the learning curve with iMacros, I have the scripting edition but I'm slowly getting basics down. I have two questions though..

I'm trying to make a script to go through several bookmarking sites and create accounts, so when it gets to a captcha I have a prompt box come up for you to enter the captcha, however, if the page is too long and the captcha is out of view, the prompt box pops up and you can't see the captcha nor scroll down to see it. I've tried the move commands but it just goes right back up out of view as soon as it gets to the prompt box command, making it impossible to enter the captcha as you can't see it. Any code that will scroll the page down and stay there when the prompt box comes up? Or is there a way to put the captcha picture into the prompt box? If you don't know what I'm talking about, an example site would be Digg, you can't visibly see the captcha on that page until you scroll down.


Nextly, captchas can be a pain, so if i enter the wrong one, how would I go about making sure the script recognizes this? Is that possible? That way if I enter it wrong by accident it doesn't just skip on to the next site.

Thanks