make a textarea resize as you type into it!

resizable-textarea.js

// BSD License - written by jon robson (http://jonrobson.me.uk)
// see http://jon.tiddlyspace.com/jquery autoresize
function autoResize(el) {
	var resize = function(ev) {
		el = ev.target;
		var div = $('<div />').addClass($(ev.target).attr("class")).hide().
			css({ "word-wrap": "break-word" }).appendTo($(el).parent())[0];
		var value = $(el).val() || "";
		var lines = value.split("\n");
		for(var i = 0; i < lines.length; i++) {
			$("<span />").text(lines[i]).appendTo(div);
			$("<br />").appendTo(div);
		}
		var h = $(div).height() + 50;
		$(ev.target).height(h);
		$(div).remove();
	};
	$(el).focus(resize).keyup(resize).blur(resize);
	$(el).focus();
}