Html – Make input invisible through css

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I have a form where depending on the website's brand one of two input fields should be visible at one given spot.

I figured I just put both input fields in the same container and then through my stylesheet set one of them to display:none;
This does hide the field, but it still makes it take up space.
I also tried setting the height and width to 0 or setting visibility to hidden or collapse but none of those worked.

Untill now all the branding things could be done with css style sheets so I would like to keep it that way.
The solution should at least be supported in IE6 & up, Firefox 2 & up and Chrome (latest).

Best Solution

why don't you use input type="hidden" ?