function checkval()
{
	var fc = document.joinForm;	
	
	if (fc.idcheck.value == 'FALSE')
	{
		alert('Click Button To Check ID');
		fc.userid.focus();
		return false;
	}	
	
	if (fc.passwd.value.length < 4) {
		alert('Enter Password More Than 4 Letters');
		fc.passwd.focus();
		return false;
	}	
	
	if (fc.username.value.length < 2)
	{
		alert('Enter Your Name');
		fc.username.focus();
		return false;
	}		
		
	if (fc.email.value.length < 1) {
		alert('Enter Your E-Mail Address');
		fc.email.focus();
		return false;
	}
	
	return true;
}

function changeid()
{
	document.joinForm.idcheck.value='FALSE';	
}

function id_dup_check()
{
	var fc=document.joinForm;
	if (fc.userid.value.length < 4) {
		alert('Enter ID More Than 4 Letters');
		fc.userid.focus();
	} else {
		var params = "userid="+document.joinForm.userid.value;
		sendRequest("id_check.php",params, callback, "POST");
	}
}

function callback() 
{
	if (httpRequest.readyState==4) {
		if (httpRequest.status == 200 ) {
			var rv = httpRequest.responseText.substring(0,1);
			//alert('#'+rv+'#');  // For DEBUG
			if (rv == '0') {
				document.joinForm.idcheck.value='TRUE';
				alert('You Can Use This ID');
			} else {
				alert('This ID is Registered by Others, Please Choose Another');
				document.joinForm.userid.value='';
				document.joinForm.userid.focus();
			}
		}
	}
}