function newsletter()
{
	if(document.getElementById('un').checked==true)
	{
		var us = 1;
	}
	else
	{
		var us=0;
	}
	var email=document.getElementById('newsletter').value;
	
	if(email!='')
	{
		var http = null;
	    if(window.XMLHttpRequest)
		http = new XMLHttpRequest();
	    else if (window.ActiveXObject)
	    http = new ActiveXObject("Microsoft.XMLHTTP");
	    http.onreadystatechange = function()
	    {
	        if(http.readyState == 4)
		{
		    if( http.status == 200 ) { 
				var odpowiedz = http.responseText;
				document.getElementById('newsletter').value='';
			}
		}
	    }
		http.open("POST", "newsletter.php", true);
	    http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	    http.send("email="+email+"&st="+us);  
	
	}
}