they say that if you want to have elements with 100% height in your web page you should add this to your body in the css:
body {
...other styles
height: 100%;
...other styles
}
Then you can set the height of your iframe container (the div) to 100% and if the iframe has already its height set to 100% then the iframe should fill all the space from top to the bottom of the page.
I personally never tried that, so I don't know if it really works, but you can try it.
I've seen an example with a page having this and it worked but I haven't seen all the rest of the css, so...
Please let us know if it worked for you!
