$(document).ready(function() { 
	var height_window = $(document).height(); 
	var width_window = $(document).width();
	
	$("#plakat").hide();
	$("#plakat").css("height", height_window);
	$("#plakat").css("width", width_window);
	$("#plakat").click(function () { 
		  $(this).slideUp(); 
		});
});