function readCookie(name) {
		var nameEQ = name + "=";
		var ca = document.cookie.split(';');
		for(var i=0; i < ca.length; i++) {
			var c = ca[i];
			while (c.charAt(0)==' ') c = c.substring(1,c.length);
			if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
		}
		return null;
	}
	function createCookie(name,value,days) {
		if (days) {
			var date = new Date();
			date.setTime(date.getTime()+(days*24*60*60*1000));
			var expires = "; expires="+date.toGMTString();
		}
		else var expires = "";
		document.cookie = name+"="+value+expires+"; path=/";
	}
	var cookie = readCookie('concreta');
	if (cookie == null) {
		var date = new Date();
		cookie = date.getTime();
		createCookie('concreta',cookie,365*20);
	}	
	var imagen = new Image();
	var jsReferer=escape(document.referrer);
	jsReferer = jsReferer.replace(/\+/g,'%2B');
	var jsLocation=escape(document.location);
	jsLocation = jsLocation.replace(/\+/g,'%2B');
	imagen.src = 'http://www.concreta.com.uy/estadisticas/preproceso/sitio22/sitio22.php?jsUrl='+escape(jsLocation)+'&jsRef='+escape(jsReferer)+'&cookie='+cookie;