如何在退出时调用另一个模态叠加层

Question

我正在使用此脚本加载我在网站上创建的一些叠加模式。模态是以这种方式触发的：

<a class="activate_modal" name="modal_window" href="#">call it now!</a> 

现在，一旦用户尝试通过在body标签上放置一个javascript事件来退出页面，我想调用另一个模态（modal_window3）。我怎么能这样做？

$(document).ready(function(){
//get the height and width of the page
var window_width = $(window).width();
var window_height = $(window).height();
//vertical and horizontal centering of modal window(s)
/*we will use each function so if we have more then 1 
modal window we center them all*/
$('.modal_window').each(function(){
    //get the height and width of the modal
    var modal_height = $(this).outerHeight();
    var modal_width = $(this).outerWidth();
    //calculate top and left offset needed for centering
    var top = (window_height-modal_height)/3;
    var left = (window_width-modal_width)/3;
    //apply new top and left css values 
    $(this).css({'top' : top , 'left' : left});
});
    $('.activate_modal').click(function(){
          //get the id of the modal window stored in the name of the activating element       
          var modal_id = $(this).attr('name');
          //use the function to show it
          show_modal(modal_id);
    });
    $('.close_modal').click(function(){
        //use the function to close it
        close_modal();
    });
});
//THE FUNCTIONS
function close_modal(){
    //hide the mask
    $('#mask').fadeOut(500);
    //hide modal window(s)
    $('.modal_window').fadeOut(500);
}
function show_modal(modal_id){
    //set display to block and opacity to 0 so we can use fadeTo
    $('#mask').css({ 'display' : 'block', opacity : 0});
    //fade in the mask to opacity 0.8 
    $('#mask').fadeTo(500,0.8);
     //show the modal window
    $('#'+modal_id).fadeIn(500);
}