SO fiddle

Test Fiddle mainly for SO Questions

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/overcast/jquery-ui.css">
<div>
    <form id="myform">
        <input type="submit" value="Submit Button" />
    </form>
</div>

CSS

.UrgencyMessage
        {
            display: none;
        }
        .day ul li.alt-lowest a
        {
            background: none repeat scroll 0 0 #FFFFFF;
            border: 1px solid #FF7B00;
        }
        .UrgencyMessage
        {
            background: url("http://www.jamesradford.net/UrgencyMessage.gif") no-repeat scroll 0 0 transparent;
            color: #FFFFFF;
            display: none;
            font-weight: bold;
            height: 70px;
            margin-left: 80px;
            margin-top: 53px;
            padding-top: 12px;
            position: absolute;
            width: 200px;
            z-index: 1;
        }
        .day ul li, .day ul li a
        {
            min-height: 62px;
        }
        .day ul li
        {
            display: block;
            list-style: none outside none;
            margin-bottom: 3px;
            padding: 0;
        }
        .tab-content .day
        {
            color: #333333;
            display: block;
            float: left;
            margin: 0 3px 5px 0;
            text-align: center;
            width: 81px;
        }
        .OutboundDaySlider
        {
            left: -84px;
            position: relative;
            width: 420px;
        }
        .OutboundDaySliderContainer
        {
            overflow: hidden;
            position: relative;
            width: 252px;
        }
        .day ul li.alt-lowest a
        {
            background: none repeat scroll 0 0 #FFFFFF;
            border: 1px solid #FF7B00;
        }
        .day ul li.alt-lowest a
        {
            background: none repeat scroll 0 0 #FFFFFF;
            border: 1px solid #FF7B00;
        }
        .day ul li, .day ul li a
        {
            min-height: 62px;
        }
        .day ul li, .day ul li a
        {
            min-height: 62px;
        }
        .day ul li a
        {
            color: #333333;
            display: block;
            padding: 25px 0 5px;
            position:...

JavaScript

$("div").dialog();

$("#myform").submit(function() {
  $(this).closest(".ui-dialog-content").dialog("close");
  return false;
});