Posteo aquí el código, en JavaScript; espero te sea útil (deberás traducir los mensajes, si te interesa)
El siguiente script, deberá insertarse entre las etiquetas <head>
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
//Tell-a-friend script
//Carl Dimmer
var initialsubj="Hay buddy, take a look at this"
var initialmsg="Hi:\n You may want to check out this site: "+window.location
var good;
function checkEmailAddress(field) {
var goodEmail = field.value.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\.info)|(\.sex)|(\.biz)|(\.aero)|(\.coop)|(\.museum)|(\.name)|(\.pro)|(\..{2,2}))$)\b/gi);
if (goodEmail) {
good = true;
}
else {
alert('Please enter a valid address.');
field.focus();
field.select();
good = false;
}
}
u = window.location;
function mailThisUrl() {
good = false
checkEmailAddress(document.eMailer.email);
if (good) {
//window.location = "mailto:"+document.eMailer.email.value+"?subject="+initialsubj+"&body="+document.title+" "+u;
window.location = "mailto:"+document.eMailer.email.value+"?subject="+initialsubj+"&body="+initialmsg
}
}
// End -->
</script>
Y lo siguiente en el <body>
<form name="eMailer">
Tell a friend:
<input type="text" name="email" size="26" value=" Enter Address Here" onFocus="this.value=''" onMouseOver="window.status='Enter email address here and tell a friend about this site...'; return true" onMouseOut="window.status='';return true">
<br>
<input type="button" value="Send this URL" onMouseOver="window.status='Click to send an email (with this page address) to a friend! Enter email address above...'; return true" onMouseOut="window.status='';return true" onClick="mailThisUrl();">
</form>
Suerte!
