function change_item(item_number) {
		if (document.getElementById('inff_' + item_number).className == 'inactive_class') {
			is_closed = true;	
		} else {
			is_closed = false;
		}
		document.getElementById('inff_1').className = 'inactive_class';
		document.getElementById('inff_2').className = 'inactive_class';				
		if (is_closed) {
			document.getElementById('inff_' + item_number).className = 'active_class';
		} else {
			document.getElementById('inff_' + item_number).className = 'active_class';			
		}
	}
	
	
	function subscribe(){
		if ( navigator.appName == 'Microsoft Internet Explorer' )
	    	var http = new ActiveXObject('Microsoft.XMLHTTP');
		else
	    	var http = new XMLHttpRequest();
	    
	    var email = document.getElementById("email").value;
	    var name = document.getElementById("name").value;
	    var subscription = document.getElementById("subscription").checked ? 1 : 0;
	    
    	var action_url 	= "../inc/subscribe.php?email=" + email
    					+ "&name=" + name + "&subscription=" + subscription;
	    http.open('get', action_url, false);
	    http.send(null);
	    if(http.readyState==4){
	    	if ( 'thanks_for_joining' == http.responseText ) {
	    		document.getElementById('newsletter_content').style.display = "none";
	    		document.getElementById('thanks_for_joining').style.display = "inline";
	    	}
	    	else 
	    		document.getElementById('errors').innerHTML = http.responseText;
    		//alert(http.responseText);
	    }
    }