function error_msg(num) {
		switch (num) {
			case 0 : alert("username must be at least 4 letters."); break;
			case 1 : alert("ID에는 공백이 사용될 수 없습니다."); break;
			case 2 : alert("username에는 숫자와 알파벳 문자만 사용됩니다."); break;
			case 3 : alert("Password must be at least 6 characters long."); break;
			case 4 : alert("Password can not contain spaces can be used."); break;
			default : break;
		}
	}
	function null_chk(str) {
		if (str.length == 0) {return;}
		else {
			for (var ii=0 ; ii < str.length ; ii++) {
				if (str.substring(ii, ii+1) == " ") {
					return;
				}
			}
		}
		return true;
	}

	function alfa_chk(str) {
		var eval = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
		var chk_val;

		if (null_chk(str) == false) {return;}
		else {
			for (var ii = 0 ; ii < str.length ; ii++) {
				chk_val = 0;
				for (var jj = 0 ; jj < eval.length ; jj++) {
					if (str.substring(ii,ii+1) == eval.substring(jj,jj+1)) {
						chk_val = 1;
						break;
					}
				}
				if (chk_val == 0) {
					return;
				}
			}
		}
		return true;
	}

	function checkUID() {
		var uidstr = document.getElementById('user_id').value;
		var pwdstr = document.getElementById('user_pw').value;
		var rurlstr = document.getElementById('returnURL').value;

		if($('input:checkbox[id="LOGIDSAVE"]').is(":checked") == true){
			var LOGIDSAVE = "YES";
		}else{
			var LOGIDSAVE = "NO";
		}

		if (uidstr.length < 4) {
			error_msg(0);
			document.getElementById('user_id').focus();
			return;
		}
		/*
		if (null_chk(uidstr) == false) {
			error_msg(1);
			document.getElementById('user_id').focus();
			return;
		}
		*/
		if (alfa_chk(uidstr) == false) {
			error_msg(2);
			document.getElementById('user_id').focus();
			return;
		}

		if (pwdstr.length < 6) {
			error_msg(3);
			document.getElementById('user_pw').focus();
			return;
		}
		if (null_chk(pwdstr) == false) {
			error_msg(4);
			document.getElementById('user_pw').focus();
			return;
		}
		var data = "uidstr=" + uidstr + "&pwdstr=" + pwdstr + "&LOGIDSAVE=" + LOGIDSAVE;
      $.ajax({
          type: "POST",
          url: "https://www.jeisys.com:6007/2016/member/php/mloginCheck.php",
		data: data,
		success: function(msg){
					if (msg == 2){
						alert('Not a registered name !');
						cleanidpw();
					}else if(msg == 3){
						alert('Please check the password again !');
						cleanpw();
					}else if(msg == 4){
						alert('Succeed, We will review your request, thank you.');
						cleanidpw();
					}else{
						alert('Welcome !!!');
						location.replace(rurlstr);
					}
          },
          error:function(request,status,error){
				alert("code:"+request.status+"\n"+"message:"+request.responseText+"\n"+"error:"+error);
          }
      });
		return;
	}

	function cleanidpw(){
		document.getElementById('user_id').value = "";
		document.getElementById('user_pw').value = "";
		document.getElementById('user_id').focus();
	}
	function cleanpw(){
		document.getElementById('user_pw').value = "";
		document.getElementById('user_pw').focus();
	}