function login_check() {
	var user="";
	var pwd="";
	var userfield = document.getElementById("loginuser");
	var pwdfield = document.getElementById("loginpwd");
	if ( userfield != 'undefined' ) {	
		user = leftTrim(userfield.value);
	}
	if ( pwdfield != 'undefined' ) {	
		pwd = leftTrim(pwdfield.value);
	}

	// Check use
	if ( user.length==0 ) {
		userfield.style.background="#FFFF00;";
		return;
	}

	if ( pwd.length==0 ) {
		pwdfield.style.background="#FFFF00;";
		return;
	}
	document.login.submit();
	
}

function leftTrim(sString) {
	while (sString.substring(0,1) == ' ') {
		sString = sString.substring(1, sString.length);
	}
	return sString;
}