Returns a function that when called, doesn't execute immediately, but waits update_interval ms before executing. If called with different arguments before then, it will

updater.js

var get_updater = function(do_update, update_interval) {
			update_interval = update_interval || 20;
			var calls = [];

			var queue_update = function() {
				var update_index = undefined;
				for(var i = 0, len = calls.length; i<len; i++) {
					if(calls[i].self === this) {
						update_index = i;
						break;
					}
				}
				if(update_index === undefined) {
					var call = {
						self: this
						, args: arguments
					};

					call.timeout_id = window.setTimeout(function() {
						do_update.apply(call.self, call.args);
						for(var i = 0, len = calls.length; i<len; i++) {
							if(call[i] === call) {
								calls.splice(i, 1);
								break;
							}
						}

					}, update_interval);
				} else {
					calls[update_index].args = arguments;
				}
			};

			var update = function() {
				queue_update.apply(this, arguments);
			};
			return update;
		};