var globalAlertMsgLogin1 = "請輸入用戶名稱";
var globalAlertMsgLogin2 = "請輸入用戶密碼";
var globalAlertMsgLogin3 = "請輸入用戶名稱或電郵地址";

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;       // Get length of string
                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 check_text(f, msg){
        if(Trim(f.value)==""){
                alert(msg);
                f.value="";
                f.focus();
                return false;
        }else{
                return true;
        }
}

function checkLoginForm(obj){
	if(!check_text(obj.UserLogin, globalAlertMsgLogin1)) ;
	if(!check_text(obj.UserPassword, globalAlertMsgLogin2)) ;
}

function loginNow(obj){
	if(!check_text(obj.UserLogin, globalAlertMsgLogin1)) return false;
	if(!check_text(obj.UserPassword, globalAlertMsgLogin2)) return false;
	obj.submit();
}