$(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();
     
        //Set height and width to mask to fill up the whole screen
        $('#mask').css({'width':maskWidth,'height':maskHeight});
         
        //transition effect    
        $('#mask').fadeIn(300);
        //$('#mask').fadeTo("slow",1);
     
        //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(300);
    });

    //if close button is clicked
    $('.window .close').click(function (e) {
        //Cancel the link behavior
        e.preventDefault();
        $('#mask, .window').hide();
        $("#login_username").css("color", "grey").attr("watermark", 1).val("username");
        $("#login_password").css("color", "grey").attr("watermark", 1).val("password");
    });

    //if mask is clicked
    $('#mask').click(function () {
        $(this).hide();
        $('.window').hide();
        $("#login_username").css("color", "grey").attr("watermark", 1).val("username");
        $("#login_password").css("color", "grey").attr("watermark", 1).val("password");
    });
});