$(document).ready(function() {	
launchWindow('#dialog1');
$('.window .close').click(function (e) {
e.preventDefault();
$('#mask').hide();
$('.window').hide();
});	
});
function launchWindow(id) {
var maskHeight = $(document).height();
var maskWidth = $(window).width();
$('#mask').css({'width':maskWidth,'height':maskHeight});
$('#mask').fadeIn(0);	
$('#mask').fadeTo("fast",0.8);	
var winH = $(window).height();
var winW = $(window).width();
$(id).css('top',  winH/2-$(id).height());
$(id).css('left', winW/2-$(id).width()/2);
$(id).fadeIn(0); 
}