function checkMail(){
	if(document.mailform.ktmail.value == ""){
		alert("Insert a valid email address.");
		document.mailform.ktmail.focus();
		return false;
	}
	if(document.mailform.ktmail.value.indexOf("@") == -1) {
		alert("This is not a valid email address.");
		document.mailform.ktmail.focus();
		return false;
	}
 }