function initForm(thisForm){
	if (thisForm != null){
		myform = thisForm;
		initialName = myform.name.value
		initialEmail = myform.email.value
	}
}

function checkNameField(){
	if (myform.name.value == initialName)
		myform.name.value = "";
}

function checkMailField(){
	if (myform.email.value == initialEmail)
		myform.email.value = "";
}

function sendMessage(){
	if (myform.name.value == ""){
		alert("Inserisci un nome!");
		myform.name.focus();
		return false;
	}
	if (myform.email.value == "" || !emailCheck(myform.email.value)){
		alert("Inserisci un indirizzo email valido!");
		myform.email.focus();
		return false;
	}
	if (myform.comments.value == ""){
		alert("Inserisci un commento!");
		myform.comments.focus();
		return false;
	}

	myform.submit();
	return true;
}

function emailCheck (emailStr){
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null){
		//alert("Email address seems incorrect (check @ and .'s)")
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	if (user.match(userPat)==null){
		//alert("The username doesn't seem to be valid.")
		return false
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null){
		for (var i=1;i<=4;i++){
			if (IPArray[i]>255){
				//alert("Destination IP address is invalid!")
				return false
			}
		}
		return true
	}
	var domainArray=domain.match(domainPat)
	if (domainArray==null){
		//alert("The domain name doesn't seem to be valid.")
		return false
	}
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	if (domArr[domArr.length-1].length<2 || 
		domArr[domArr.length-1].length>3){
		//alert("The address must end in a three-letter domain, or two letter country.")
		return false
	}
	if (len<2){
		//var errStr="This address is missing a hostname!"
		//alert(errStr)
		return false
	}
	return true;
}