$(document).ready(function () { // if user clicked on button, the overlay layer or the dialogbox, close the dialog $('a.btn-ok, #dialog-overlay, #dialog-box').click(function () { $('#dialog-overlay, #dialog-box').hide(); return false; }); // if user resize the window, call the same function again // to make sure the overlay fills the screen and dialogbox aligned to center $(window).resize(function () { //only do it if the dialog box is not hidden if (!$('#dialog-box').is(':hidden')) popup(); }); }); //Popup dialog function popup(message) { // get the screen height and width var maskHeight = $(document).height(); var maskWidth = $(window).width(); // calculate the values for center alignment var dialogTop = (maskHeight/3) - ($('#dialog-box').height()); var dialogLeft = (maskWidth/2) - ($('#dialog-box').width()/2); // assign values to the overlay and dialog box $('#dialog-overlay').css({height:maskHeight, width:maskWidth}).show(); $('#dialog-box').css({top:dialogTop, left:dialogLeft}).show(); // display the message $('#dialog-message').html(message); }