function _isValidUserid(val) 
	{
		var pattern = /^[a-zA-Z0-9]{1}[a-zA-Z0-9_]{3,12}$/;
		if(pattern.test(val))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	
	function _isValidUserPass(val) 
	{
		var pattern = /^[a-zA-Z0-9]{3,12}$/;
		if(pattern.test(val))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
	
	function chkLogin()
	{

		var form = document.loginForm;

		if(form.mem_id.value == "")
		{
			alert(LOGIN_0001);
			form.mem_id.focus();
			return;
		}
		else
		{
			if(!_isValidUserid(form.mem_id.value))
			{
				alert(LOGIN_0002);
			    form.mem_id.focus();
			    return;
			}
		}				
		
		if(form.mem_pw.value == "")
		{
			alert(LOGIN_0003);
			form.mem_pw.focus();
			return;
		}
		else
		{
			if(!_isValidUserPass(form.mem_pw.value))
			{
				alert(LOGIN_0004);
			    form.mem_pw.focus();
			    return;
			}				
		}
		
		if(input_chk())
		{
			form.action = "/proc/mypage/login_proc.jsp";
			form.submit();
		}
	}
	
	function chkLoginLayer()
	{

		var form = document.loginForm;

		if(form.mem_id.value == "")
		{
			alert(LOGIN_0001);
			form.mem_id.focus();
			return;
		}
		else
		{
			if(!_isValidUserid(form.mem_id.value))
			{
				alert(LOGIN_0002);
			    form.mem_id.focus();
			    return;
			}
		}				
		
		if(form.mem_pw.value == "")
		{
			alert(LOGIN_0003);
			form.mem_pw.focus();
			return;
		}
		else
		{
			if(!_isValidUserPass(form.mem_pw.value))
			{
				alert(LOGIN_0004);
			    form.mem_pw.focus();
			    return;
			}				
		}
		
		if(input_chk())
		{
			form.action = "/proc/reservation/login_proc.jsp";
			form.submit();
		}
	}