function checkmail (form){
		var email = form.email.value
		if (email.indexOf('@', 0) == -1 || email.indexOf('.', 0) == -1){ 
			alert("L'indirizzo e-mail digitato non è valido!")
			form.email.focus();
			return false
		}
		}
									document.write('<table cellspacing=0 cellpadding=4 border=0 align="center" class="cancellazione">');
									document.write('<form action="http://www.newsletter.it/unsubscribe.asp" method="post" onSubmit="return checkmail(this)">');
									document.write('<input type="hidden" name="idlista" value="959">');
									document.write('<input type="hidden" name="idutente" value="1241">');
									document.write('<tr>');
										document.write('<td>Indirizzo email:</td>');
										document.write('<td><input type="text" name="email" size=20 maxlength=255></td>');
									document.write('</tr>');
									document.write('<tr>');
										document.write('<td colspan=2 align="center"><input type="submit" value=" Cancellati "></td>');
									document.write('</tr>');
									document.write('</form>');
									document.write('</table>');