$(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);
    
}