问如何解决对话框运行1秒并消失？

$(document).ready(function() {  

    // Append dialog pop-up modem to body of page
    $('body').append("<div id='confirmDialog' title='Confirm'><p><span class='ui-icon ui-icon-alert' style='float:left; margin:0 7px 20px 0;'></span>Are you sure you want to leave " + brandName + "? <br /> Your order will not be saved.</p></div>");

    // Create Dialog box
    $('#confirmDialog').dialog({
      autoOpen: false,
      modal: true,
      overlay: {
        backgroundColor: '#000',
        opacity: 0.5
      },
      buttons: {
        'I am sure': function() {
          var href = $(this).dialog('option', 'href', this.href);
          window.location.href = href;
        },
        'Complete my order': function() {
          $(this).dialog('close');
        }
      }
    });

    // Bind event to Before user leaves page with function parameter e
    $(window).bind('beforeunload', function(e) {    
        // Mozilla takes the
        var e = $('#confirmDialog').dialog('open').dialog('option', 'href', this.href);
        // For IE and Firefox prior to version 4
        if (e){
            $('#confirmDialog').dialog('open').dialog('option', 'href', this.href);
        }
        // For Safari
        e.$('#confirmDialog').dialog('open').dialog('option', 'href', this.href);
    }); 

    // unbind function if user clicks a link
    $('a').click(function(event) {
        $(window).unbind();
        //event.preventDefault();
        //$('#confirmDialog').dialog('option', 'href', this.href).dialog('open');
    });

    // unbind function if user submits a form
    $('form').submit(function() {
        $(window).unbind();
    });
});