$(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/2) - ($('#dialog-box').height());
	var dialogLeft = (maskWidth/2) - ($('#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);			
}