function setModalClick() {
    //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();

        //Set height and width to mask to fill up the whole screen  
        $('#mask').css({ 'width': maskWidth, 'height': maskHeight });

        //transition effect       
        //  $('#mask').fadeIn(2000);
        $('#mask').fadeTo("slow", 0.5);

        //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(500);

    });

}
function HideModal() {
    $('#mask, .window').hide();
}
$(document).ready(function() {

    setModalClick();
    //if close button is clicked  
    $('.window .close').click(function(e) {
        //Cancel the link behavior  
        e.preventDefault();
        $('#mask, .window').hide();
    });

    //if mask is clicked  
    $('#mask').click(function() {
        $(this).hide();
        $('.window').hide();
    });

});