jQuery UI Alert (with alert() override)

gistfile1.js

getOrCreateDialog = function (id) {
    $box = $('#' + id);
    if (!$box.length) {
        $box = $('<div id="' + id + '"><p></p></div>').hide().appendTo('body');
    }
    return $box;
}

customAlert(message, title, options, callback){
	callback = callback || function(){};
	
	var default = {
		modal		: true,
		resizable	: false,
		buttons		: {
			Ok: function() {
				$(this).dialog('close');
				return (typeof callback == 'string') ?
				window.location.href = callback :
				callback();
			}
		},
		show		: 'fade',
		hide		: 'fade',
		minHeight	: 50,
		dialogClass	: 'modal-shadow'
	}
	$alert = getOrCreateDialog('alert');

	$("p", $alert)
		.attr("title", title)
		.html(message);
	
	$alert.dialog($.extend({}, default, opcoes));
}

window.alert = function (message) {
	customAlert(message, 'Alert');
}