function login_submit() {
	if( document.login.id.value == '') {
		alert('Enter your email');
	} else if (document.login.pw.value == '') {
		alert('Enter your password');
	} else {
		document.login.submit();
	}
}

function write_submit() {
	if( document.write.lang.value == '' || document.write.lang.value == -1 ) {
		alert('choose your language');
	} else {
		document.write.submit();
	}
}

function login_require() {
		alert('please login');
}

function comment_submit() {
	if( document.comment.post.value == '') {
		alert('Enter the comment');
	} else if( document.comment.lang.value == '' || document.comment.lang.value == -1 ) {
		alert('choose your language');
	} else {
		document.comment.submit();
	}
}

function check_name() {
	var name = reg.name.value;
	var ch;
	for(i=0; i<name.length; i++)
	{
		ch = name.substr(i, 1).toUpperCase().charCodeAt();
		if( ch == 32 || ( ch >= 65 && ch <= 90 ) )
			continue;
		else
		{
			alert(name.substr(i,1));
			alert(name.substr(i,1).charCodeAt());
			alert('You can use alphabet and blank.');
			reg.name.value = '';
			reg.name.focus();
			return;
		}
	}
}

function register_submit() {
	var format = /^((\w|[\-\.])+)@((\w|[\-\.])+)\.([A-Za-z]+)$/;
	if( document.reg.email.value == '') {
		alert('Enter your email');
	} else if( document.reg.email.value.search(format) == -1 ) {
		alert('Use correct email');
	} else if (document.reg.pw.value == '') {
		alert('Enter your password');
	} else if (document.reg.pw.value.length <  6) {
		alert('Use more than 6 characters');
	} else if ( document.reg.name.value == '') {
		alert('Enter your name');
	} else if ( document.reg.nation.value == -1) {
		alert('Choose your nationality');
	} else if ( document.reg.l1.value == -1) {
		alert('Choose your mothertongue');
	} else if ( document.reg.l2.value == -1) {
		alert('Choose your 2nd language');
	} else if ( document.reg.l3.value == -1) {
		alert('Choose your 3rd language');
	} else {
		document.reg.submit();
	}
}

function update_submit() {
	if (document.reg.oldpw.value == '' ) {
		alert('Enter your password');
	} else if ( document.reg.name.value == '') {
		alert('Enter your name');
	} else if ( document.reg.nation.value == -1) {
		alert('Choose your nationality');
	} else if ( document.reg.l1.value == -1) {
		alert('Choose your mothertongue');
	} else if ( document.reg.l2.value == -1) {
		alert('Choose your 2nd language');
	} else if ( document.reg.l3.value == -1) {
		alert('Choose your 3rd language');
	} else {
		document.reg.submit();
	}
}