Fixing #230; add a scrollbar to the PM popup dialog if necessary. This wasn't as easy as I thought. Had to wrap the PM text in a div with its styling (max-height and overflow). If I then resized the dialog, I'd get two scrollbars. So for now, made the dialog non-resizable.

.panel_wrapper div.current {
	height: 290px;
}

#id, #style, #title, #dir, #hreflang, #lang, #classlist, #tabindex, #accesskey {
	width: 200px;
}

#events_panel input {
	width: 200px;
}