function check_login(form)
{
	if(CheckID(form)==false){return false;}
	if(CheckPswd(form)==false){return false;}
}

// ID üũ
function CheckID(form){

	//¿µ¹®ÀÚ,¼ýÀÚ
	form.id.value = trimString(form.id.value);
	if(form.id.value.length == 0){
		alert('ID¸¦ ÀÔ·ÂÇϼ¼¿ä');
		form.id.focus();
		return false;
	}
	if(!form.id.value.match(/^[a-zA-Z0-9]{4,20}$/)){
		alert('IDÇü½ÄÀÌ ¿Ã¹Ù¸£Áö ¾Ê½À´Ï´Ù.');
		form.id.focus();
		form.id.select();
		return false;
	}
	return true;
}
// ºñ¹Ð¹øÈ£ üũ
function CheckPswd(form){
	form.pass.value = trimString(form.pass.value);
	if(form.pass.value.length == 0){
		alert('ºñ¹Ð¹øÈ£¸¦ ÀÔ·ÂÇϼ¼¿ä.');
		form.pass.focus();
		return false;
	}else if(form.pass.value.length < 4 || form.pass.value.length > 20){
		alert('ºñ¹Ð¹øÈ£´Â 4 - 20ÀÚ¸®ÀÔ´Ï´Ù.');
		form.pass.focus();
		form.pass.select();
		return false;
	}else if(!form.pass.value.match(/^[a-zA-Z0-9]{4,20}$/)){
		alert('ºñ¹Ð¹øÈ£ Çü½ÄÀÌ ¿Ã¹Ù¸£Áö ¾Ê½À´Ï´Ù.');
		form.pass.focus();
		form.pass.select();
		return false;
	}
	return true;
}
function trimString (str) {
	str = this != window? this : str;
	return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}