function controllo_newsletter() {

     // Variabili associate ai campi del form newsletter
     var Nome = document.newsletter_form.newsletter_nome.value;
     var Email = document.newsletter_form.newsletter_email.value;
     var Autorizzo_trattamento = document.newsletter_form.newsletter_autorizzo_trattamento.checked;

        //Effettua il controllo sul campo NOME
        if ((Nome == "") || (Nome == "undefined")) {
           alert("Il campo Nome o Alias è obbligatorio.");
           document.newsletter_form.newsletter_nome.focus();
           return false;
        }

     // Espressione regolare dell'EMAIL
     var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;

       if (!email_reg_exp.test(Email) || (Email == "") || (Email == "undefined")) {
           alert("Inserire un indirizzo Email corretto.");
           document.newsletter_form.newsletter_email.focus();
           return false;
        }

        //Effettua il controllo sul checkbox AUTORIZZO TRATTAMENTO
        if (Autorizzo_trattamento == 0) {
           alert("Per l'invio del modulo è necessario spuntare la casella: AUTORIZZO IL TRATTAMENTO DEI MIEI DATI PERSONALI.");
           ddocument.newsletter_form.newsletter_autorizzo_trattamento.focus();
           return false;
        }


        //INVIA IL MODULO
        else {
           document.newsletter_form.submit();
        }
  }





<!--


function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


















//Contents for menu 1
var menu1=new Array()
menu1[0]='<a href="/duplicazione_masterizzazione_cd_dvd_vhs.php" title="DUPLICAZIONE E MASTERIZZAZIONE">DUPLICAZIONE E MASTERIZZAZIONE</a>'
menu1[1]='<a href="/stampaggio_cd_dvd_cover.php" title="STAMPAGGIO">STAMPAGGIO</a>'
menu1[2]='<a href="/personalizzazione_supporti_vergini.php" title="PERSONALIZZAZIONE SUPPORTI VERGINI">PERSONALIZZAZIONE SUPPORTI VERGINI</a>'
menu1[3]='<a href="/post_produzione.php" title="POST PRODUZIONE">POST PRODUZIONE</a>'
menu1[4]='<a href="/trascodifica_filmati_video.php" title="TRASCODIFICA FILMATI">TRASCODIFICA FILMATI</a>'
menu1[5]='<a href="/preventivo.php" title="PREVENTIVO ONLINE">PREVENTIVO ONLINE</a>'

//Contents for menu 2, and so on
var menu2=new Array()
menu2[0]='<a href="/cd_dvd_pen_drive/cd_vergini-1.htm" title="">CD</a>'
menu2[1]='<a href="/cd_dvd_pen_drive/dvd_vergini-2.htm" title="">DVD</a>'
menu2[2]='<a href="/cd_dvd_pen_drive/cd_card_vergini-3.htm" title="">CD CARD</a>'
menu2[3]='<a href="/cd_dvd_pen_drive/mini_cd_vergini-4.htm" title="">MINI CD</a>'
menu2[4]='<a href="/cd_dvd_pen_drive/vhs-5.htm" title="">VHS</a>'
menu2[5]='<a href="/cd_dvd_pen_drive/floppy_disK-6.htm" title="">FLOPPY DISK</a>'
menu2[6]='<a href="/cd_dvd_pen_drive/pen_drive_usb-7.htm" title="">PEN DRIVE USB</a>'
menu2[7]='<a href="/cd_dvd_pen_drive/MINI_DVD-8.htm" title="">MINI DVD</a>'

//Contents for menu 3, and so on
var menu3=new Array()
menu3[0]='<a href="/cd_dvd_pen_drive/cd_dvd-9.htm" title="">CD/DVD</a>'
menu3[1]='<a href="/cd_dvd_pen_drive/cd_card-10.htm" title="">CDCARD</a>'
menu3[2]='<a href="/cd_dvd_pen_drive/mini_cd-11.htm" title="">MINICD</a>'
menu3[3]='<a href="/cd_dvd_pen_drive/gadget_confezioni-12.htm" title="">GADGET</a>'
menu3[4]='<a href="/cd_dvd_pen_drive/altri_prodotti-13.htm" title="">VARIE</a>'

var menuwidth='165px' //default menu width
var menubgcolor='#8DCE00'  //menu bgcolor
var disappeardelay=250  //menu disappear speed onMouseout (in miliseconds)
var hidemenu_onclick="yes" //hide menu when user clicks within menu?

/////No further editting needed

var ie4=document.all
var ns6=document.getElementById&&!document.all

if (ie4||ns6)
document.write('<div id="dropmenudiv" style="visibility:hidden;position:absolute;width:'+menuwidth+';background-color:'+menubgcolor+'" onMouseover="clearhidemenu()" onMouseout="dynamichide(event)"></div>')

function getposOffset(what, offsettype){
var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
var parentEl=what.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function showhide(obj, e, visible, hidden, menuwidth){
if (ie4||ns6)
dropmenuobj.style.left=dropmenuobj.style.top=-500
if (menuwidth!=""){
dropmenuobj.widthobj=dropmenuobj.style
dropmenuobj.widthobj.width=menuwidth
}
if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
obj.visibility=visible
else if (e.type=="click")
obj.visibility=hidden
}

function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function clearbrowseredge(obj, whichedge){
var edgeoffset=0
if (whichedge=="rightedge"){
var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
dropmenuobj.contentmeasure=dropmenuobj.offsetWidth
if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth
}
else{
var topedge=ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset
var windowedge=ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
dropmenuobj.contentmeasure=dropmenuobj.offsetHeight
if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure){ //move up?
edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight
if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either?
edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge
}
}
return edgeoffset
}

function populatemenu(what){
if (ie4||ns6)
dropmenuobj.innerHTML=what.join("")
}

function dropdownmenu(obj, e, menucontents, menuwidth){
if (window.event) event.cancelBubble=true
else if (e.stopPropagation) e.stopPropagation()
clearhidemenu()
dropmenuobj=document.getElementById? document.getElementById("dropmenudiv") : dropmenudiv
populatemenu(menucontents)

if (ie4||ns6){
showhide(dropmenuobj.style, e, "visible", "hidden", menuwidth)
dropmenuobj.x=getposOffset(obj, "left")
dropmenuobj.y=getposOffset(obj, "top")
dropmenuobj.style.left=dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px"
dropmenuobj.style.top=dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px"
}

return clickreturnvalue()
}

function clickreturnvalue(){
if (ie4||ns6) return false
else return true
}

function contains_ns6(a, b) {
while (b.parentNode)
if ((b = b.parentNode) == a)
return true;
return false;
}

function dynamichide(e){
if (ie4&&!dropmenuobj.contains(e.toElement))
delayhidemenu()
else if (ns6&&e.currentTarget!= e.relatedTarget&& !contains_ns6(e.currentTarget, e.relatedTarget))
delayhidemenu()
}

function hidemenu(e){
if (typeof dropmenuobj!="undefined"){
if (ie4||ns6)
dropmenuobj.style.visibility="hidden"
}
}

function delayhidemenu(){
if (ie4||ns6)
delayhide=setTimeout("hidemenu()",disappeardelay)
}

function clearhidemenu(){
if (typeof delayhide!="undefined")
clearTimeout(delayhide)
}

if (hidemenu_onclick=="yes")
document.onclick=hidemenu









 function window_open(filename, x, y, target)
  { windowops = eval("'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=" + x + ",height=" + y + "'");
    newwindow=window.open(filename, target, windowops);
    return;
  }








  function MM_popupMsg(msg) {
    alert(msg);
}









//-->