var showModalWindow = function(e,currentControl) {

    //select all the a tag with name equal to modal
        //Cancel the link behavior
        e.preventDefault();
        //Get the A tag
        var id = $(currentControl).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(1000);
        $('#mask').fadeTo("slow", 0.8);

        //Get the window height and width
        var winH = $(document).height();
        var winW = $(document).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(2000);


}