jms

I think this might help with your transparency issue. Although I can't test it, as I use Linux.I did a quick test on my computer and the iframe was transparent by default in my browser (Firefox 1.5.0.4).Also, to make the links open in the iframe you must give the iframe a name and then use the iframe's name as the target attribute's value in your link.

<a href="whatever" target="myiframe">link</a><iframe src="whatever" name="myiframe" />

I think you get this error because you're putting XHTML through the CSS validator. Try putting it though the XHTML one. You'll have to put your CSS into a seperate stylesheet to test it in the CSS validator.

I have no idea what it is you want to do, but this might help:HTML URL-encoding Reference