You can use jquery fancybox plugin. Available here : http://fancybox.net/
Use
helpers : {
overlay : {closeClick: false}
}
To get the required result. Your code should look like this
$(document).ready(function() {
$(".fancybox").fancybox({
closeClick : false, // prevents closing when clicking INSIDE fancybox
openEffect : 'none',
closeEffect : 'none',
helpers : {
overlay : {closeClick: false} // prevents closing when clicking OUTSIDE fancybox
}
}).trigger("click");
});