function emcheck(mail){
var pattern1 =/^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i;
var pattern2 =/[\\\n]{1,}/;
var result = (pattern1.test(mail) && ! pattern2.test(mail)) ;
if (result !=true ) {
alert ('Please enter a valid email address');
}
}

function nacheck(name){
if (name.indexOf(';') != -1){
alert('Please re-input your name');
}
}
function spamcheck(){
if (document.getElementById("spam").value == "stp"){
document.forms[0].submit()
}
}