$(document).ready(function() {

    //select all the a tag with name equal to modal
    $('a[name=modalAdvanced]').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 = $(document).width();

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

        //transition effect        
        $('#mask').fadeIn(100);
        $('#mask').fadeTo("fast", 0.9);

        //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 + $(window).scrollTop());
        $(id).css('left', winW / 2 - $(id).width() / 2 + $(window).scrollLeft());

        //transition effect   
        $(id).fadeIn(500);

    });

    //if close button is clicked   
    $('.window .close').click(function(e) {
        //Cancel the link behavior   
        e.preventDefault();
        //$('#mask, .window').hide();
        $('#mask, .window').fadeOut(100);
    });

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

    //select all the a tag with name equal to modalquestion
    $('a[name=modalQuestion]').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 = $(document).width();

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

        //transition effect
        $('#maskQuestion').fadeIn(100);
        $('#maskQuestion').fadeTo("fast", 0.9);

        //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 + $(window).scrollTop());
        $(id).css('left', winW / 2 - $(id).width() / 2 + $(window).scrollLeft());

        //transition effect   
        $(id).fadeIn(500);

    });

    //if close button is clicked   
    $('.window .close').click(function(e) {
        //Cancel the link behavior   
        e.preventDefault();
        //$('#mask, .window').hide();
        $('#maskQuestion, .window').fadeOut(100);
    });

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

});