Vi posto il mio codice. Vorrei rendere i campi: cognome, mail, oggetto e messaggio obbligatori.
Poi mi dovreste aiutare per la privacy e per il captcha. Per quanto riguarda il captcha mi piacerebbe questo: http://www.phpcaptcha.org/
Per favore mi scrivete tutto il codice. Sono ancora un principiante dell'html.
codice:
<body>
<style type="text/css">
body {
	background-image: url(images/background.png);
	background-repeat: repeat;
	margin: 0px;
	padding: 0px;
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	text-align: center;
}
#bg_corposito {
	background-image: url(images/bg_table.png);
	background-repeat: repeat-y;
}
#titolo {
	font-family: Androgyne;
	font-size: 24px;
	padding-left: 20px;
	color: #0C20B8;
}
#contact {
	text-align: left;
	font-size: 14px;
	padding-left: 20px;
}
.space {
	padding-top: 8px;
	margin-bottom: 5px;
	padding-left: 3px;
}
.changeColor {
	color: #0A1B92;
	text-decoration: none;
}
.changeColor:hover {
	text-decoration: underline;
}
</style>
codice:
<script type="text/javascript">
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];}
}
</script>

</head>


<body>
<form method="post" action="mailto:xxx@xxxxxxxxxx.it">
      
      <div><p style="margin-bottom:5px; padding-left:3px;">Nome</p><input type="text" name="nome" maxlength="50" size="40" border="1" /></div>
      <div><p class="space">Cognome*</p><input type="text" name="cognome" maxlength="50" size="40" border="1" /></div>
      <div><p class="space">Telefono</p><input type="tel" name="telefono" maxlength="50" size="40" border="1" /></div>
      <div><p class="space">Email*</p><input type="email" name="email" maxlength="50" size="40" border="1" /></div>
      <div><p class="space">Oggetto*</p><input type="text" name="oggetto" maxlength="50" size="60" border="1" /></div>
      <div><p class="space">Messaggio*</p><textarea name="messaggio" cols="60" rows="10"></textarea></div>
      
      
      <div><p style="margin-bottom:5px; padding-top:8px; font-size:12px;"><input type="checkbox" style="float:left; margin-top:1px;" name="privacy" border="1" /><span>Dopo aver preso visione della presente informativa sulla privacy* 
acconsento al trattamento dei dati personali comunicati.</span></p></div>
      
      
      <div><p class="space"></p><input type="text" name="captcha_code" maxlength="6" style="width:90px; height:25px; text-transform:uppercase; font-size:18px; padding-left:5px;"/>[img]captcha/securimage_show.php[/img]<p style="margin-top:8px; font-size:12px;">Digita il testo dell'immagine*</p></div>
      
      
      <div>

<input type="submit" value="Invia" name="invia" border="1"><input type="reset" value="Ripristina" name="ripristina" style="margin-left:20px;" border="1"/></p></div>
      
      </form>
</body>