$(document).ready(function() {	

	//select all the a tag with name equal to modal
		//Cancel the link behavior
		//Get the A tag
		var id = $('#lightbox');	
		//Get the screen height and width
		var maskHeight = $(document).height();
		var maskWidth = $(window).width();
		//Set heigth and width to mask to fill up the whole screen
		$('#mask').css({'width':maskWidth,'height':maskHeight, 'opacity':0.8});		
		//transition effect		
		$('#mask').fadeIn(50);		
		//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).show(); 	
	//if close button is clicked
	$('.window .close').click(function () {
		//Cancel the link behavior
		$('#mask').hide();
		$('.window').hide();
	});	
	$(window).resize(function () {resize();});
});