function grispage() {
					document.getElementById('upload').style.display='block';
					var id = $(this).attr('href');
					var maskHeight = $(document).height();
					var maskWidth = $(window).width();
					$('#mask').css({'width':maskWidth,'height':maskHeight});
					$('#mask').fadeTo("slow",0.8);	
					var winH = $(window).height();
					var winW = $(window).width();
					$(id).css('top',  winH/2-$(id).height()/2);
					$(id).css('left', winW/2-$(id).width()/2);
					$(id).fadeIn(2000); 
				}