jQuery.inSite = function(){
		var $inSite = false;
		$(document).click(function(event){
			var coordinate = event.clientY;
			if(typeof coordinate === "number"){
				$inSite = true;
			}
			else{
				$inSite = false;
			}
		});
		$(window).unload(function(){
			if(!$inSite){
				/*
				TODO
				*/
				alert("Bye!");
				location.replace('index.php');
			}
		});
		}