Slidedown Panel

I am making an aspx page with C# codebehind and i am having trouble with some parts of the page that I want to make. I have a button to add feedback to content on the page and what I am trying to do is have a panel under the button that is at 0px height. What I want to happen is when I click the button I want the panel to look as if it is sliding open to display its content. I thought there might be some javascript that I could use to just increase the height of the panel until it reaches a certain height so it looks as if it is sliding open. If anyone could help me out with this it would be much appreciated. Thanks.

-Dakota

Well, you can use a absolute positioned DIV and change the height but you smartest option is to use Flash.

Ok so if I use either one, the absolute div or the flash, with they both give me the effect of it sliding open. There will be text below the textbox i will be opening so when i slide open the textbox i want the text below it to slide down out of the way as the textbox slides open. Is this possible?

Wow, I am confused. Can you draw a diagram? Either way I think you are way to complicated for any web page or web-based application.