$(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 = $(window).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 = $(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(2000);   
	 
	});  
	 
	//if close button is clicked  
	$('.window .close').click(function (e) {  
		//Cancel the link behavior  
		e.preventDefault();  
		$('#mask, .window').hide();  
	});       
	 
	//if mask is clicked  
	$('#mask').click(function () {  
		$(this).hide();  
		$('.window').hide();  
	});           
       
});