function isBlank(s)
{
	var len=s.length;
	var i;
	for(i=0;i<len;++i)
	{
		if(s.charAt(i)!=" ") return false;
	}
	return true;
}

function check_form()
{
	if(isBlank(document.login_form.UserName.value))
	{
		alert('Please input Username');
		document.login_form.UserName.focus();
		return false;
	}
	
	if(isBlank(document.login_form.UserPassword.value))
	{
		alert('Please input Password');
		document.login_form.UserPassword.focus();
		return false;
	}
	document.login_form.action="members.php";
	document.login_form.submit();
	return true;
}