How could I get a <div> to be the same height in all browsers? It's just a simple <div> tag with height properties, what should I add?

CSS:
* {
margin: 0;
padding: 0;
}
div#that_div {
height: 200px;
}
...
HTML:
<div id="that_div">
content here
</div>
that should do it! :)

What browsers are you having problems with? Do you have a proper doctype at the top of your documents?

You can also throw in overflow: hidden;

<div id="that_div">
content here
</div>
yup, that's the wrapper.
do it before the other text in the body.