function ShowAndHide(id1,id2){
if(document.getElementById){
    el1=document.getElementById(id1);
    el2=document.getElementById(id2);
    if(el1.style.display=="none"){
        el1.style.display="block";
        el2.style.display="none";
        }
    else{
        el1.style.display="none";
        el2.style.display="block";
        }
    }
}

function validate_email() {
    if(-1 == document.newsletter.emailnews.value.indexOf("@")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
	if(-1 == document.newsletter.emailnews.value.indexOf(".")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
    if(-1 != document.newsletter.emailnews.value.indexOf(",")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
    if(-1 != document.newsletter.emailnews.value.indexOf("#")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
    if(-1 != document.newsletter.emailnews.value.indexOf("!")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
    if(-1 != document.newsletter.emailnews.value.indexOf(" ")) { 
       document.newsletter.emailnews.focus(); 
       alert("Email non valida!"); 
       return false; 
       }
    if(document.newsletter.emailnews.value.length == (document.newsletter.emailnews.value.indexOf("@")+1) ) {
       document.newsletter.emailnews.focus();
       alert("Email non valida!");
       return false;
       }

    if(document.newsletter.emailnews.value.length == 0) { 
      document.newsletter.emailnews.focus(); 
      alert("Inserisci un indirizzo Email!"); 
      return false; 
      }
	ajaxpage("pages/newsletter.php?tipoop=0&emailnews="+document.newsletter.emailnews.value+"","content");
	document.newsletter.emailnews.value="";
    return true;
 }