$(document).ready(function () {

    //select all the a tag with name equal to modal
    $('a[name=modal]').click(function (e) {
        //Cancel the link behavior
        e.preventDefault();

        //Get the A tag
        var id = $(this).attr('href');

        //Get the screen height and width
        var maskHeight = $(document).height();
        var maskWidth = $(window).width();

        //transition effect		
        $('#mask').fadeTo("fast", 0.8);

        //Get the window height and width
        var winH = $(window).height();
        var winW = $(window).width();

        //Set the popup window to center
        $(id).css('top', winH / 2 - $(id).height() / 2);
        $(id).css('left', winW / 2 - $(id).width() / 2);

        //transition effect
        $(id).fadeIn("fast");

    });

    //if close button is clicked
    $('.popup #cancel').click(function (e) {
        //Cancel the link behavior
        e.preventDefault();

        $('#mask').hide();
        $('.popup').hide();
    });

    //if close button is clicked
    $('.popup #OK').click(function (e) {
        //Cancel the link behavior
        e.preventDefault();

        $('#mask').hide();
        $('.popup').hide();
    });

});