function IsNumber(data){
	for(var i = 0 ; i < data.length ; i++ ){
		if(data.substring(i, i+1) < '0' || data.substring(i, i+1) > '9')
			return false;
	}
	return true;
}

function Check()
{
	var theForm = document.login
	var PASSWORD = theForm.Pass.value;

	function ErrMsg(msg ) {
     alert(msg);
	}

  if (PASSWORD == "") {
		ErrMsg("ÀÚ³àPC°ü¸®¿¡ °¡ÀÔÇϽŠºñ¹Ð¹øÈ£¸¦ ÀÔ·ÂÇØ ÁֽʽÿÀ.");
 		theForm.Pass.focus();
		return false;
	} 
    else if (PASSWORD.length <4) {
			ErrMsg("ºñ¹Ð¹øÈ£´Â 4±ÛÀÚ ÀÌ»óÀÇ ¼ýÀÚ¸¦ ÀÔ·ÂÇØ ÁֽʽÿÀ.");
 			theForm.Pass.focus();
			return false;
	} 
	else if(!(IsNumber(PASSWORD))) {
		alert("ºñ¹Ð¹øÈ£´Â ¼ýÀÚ¸¸ °¡´ÉÇÕ´Ï´Ù. ´Ù½Ã ÀÔ·ÂÇØ ÁֽʽÿÀ.");
		theForm.Pass.value="";
		theForm.Pass.focus();
		return false;			
	}
	return true;				
}