Sizeable Squeeze pages

I'm not sure if I'm following, why do you want to change the size?

Inside Lead Impact they have a "pop up" window where people go to a website and in that window potential prospects put their name and email. A marketing scheme that allows you to start an email list to promote products. I have tested my Landing page and it does not fit with the pop up window for Lead Impact. In order for people to enter their name and email window must be dragged open for people to see the whole landing page. In marketing your Landing Page you have little time to attract a potential prospect, if the window must be dragged open to see the landing page, prospect will likely close the window cause their unable to see the full landing page. It needs to fit in required dimensions because the message needs to be clear and the opt-in must appear for them to "opt-in" their name and email.

Hope this is understandable, but that is why I need it to fit into 800x600 dimensions so the whole landing page is seen immediately.

I understand what you are trying to do, but using Wordpress isn't the best way to do this. Unless your amazing Squeeze Page is built in Wordpress already, but I wouldn't have it be the starting point.

If your squeeze is already built into Wordpress, just hire someone to help edit the theme for you. There isn't a plugin that will be a quick fix, but shouldn't cost much on oDesk.