function LTrim(str)

{
    var whitespace = new String(" \t\n\r");
    var s = new String(str);
    if (whitespace.indexOf(s.charAt(0)) != -1)
    {
        var j=0, i = s.length;
        while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
        {
            j++;
        }
        s = s.substring(j, i);
    }
    return s;
}
function RTrim(str)
{
    var whitespace = new String(" \t\n\r");
    var s = new String(str);
    if (whitespace.indexOf(s.charAt(s.length-1)) != -1)
    {
        var i = s.length - 1;
        while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
        {
            i--;
        }
        s = s.substring(0, i+1);
    }
    return s;
}
function Trim(str)
{
    return RTrim(LTrim(str));
}
function checkform(form)
{
    if(Trim(form.username.value)=='')
    {
        alert('用户名不能为空！');
        form.username.focus();
        return false;
    }
    if(Trim(form.pwd.value)=='')
    {
        alert('密码不能为空！');
        form.pwd.focus();
        return false;
    }
    return true;
}
function personLogin(selects)
{
	var loginType = selects.value;
	if (loginType == "enter")
		return
	else
		{
			window.location="/bbs/login.php";
		}
	
}
function checkRegister()
{
	var usertypeOptions = document.loginAction.usertype;
	if (usertypeOptions.value == 'enter')
	{
		window.location="/login/register_enter.php";
	}
	else
	{
		window.location="/bbs/register.php";
	}
}