function chk() 
{
if (document.PRE.name.value == "")
{
	alert ("Please, enter your first name!");
	document.PRE.name.focus();
	return false;
}
if (document.PRE.last.value == "")
{
	alert ("Please, enter your last name!");
	document.PRE.last.focus();
	return false;
}
if (document.PRE.phone.value == "")
{
	alert ("Please, enter your telephone. Put none if not applicable");
	document.PRE.phone.focus();
	return false;
}

if ((document.PRE.from.value.indexOf("@") == -1) ||  (document.PRE.from.value.indexOf(".") == -1) )
{
	alert ("Please, enter your correct Email address!");
	document.PRE.from.focus();
	return false;
}
return true;
}