// JavaScript Document


/**
* alert string and return to form
*/
function form_alert(str)
{
	alert(str);
	return false;
}


/**
* alert null this field
*/
function field_null(str)
{
	alert(str+" is null !!");
	return false;
}


/**
* check this field is english only
*/
function checkNum(val){
		var val = (isNaN(val))? false :true;
		return val;
}


/**
*	check image format
*/
function check_image_format(path)
{
	var type = new Array('jpg', 'gif');
	var arr = String(path).toLowerCase().split(".");
	var img_format = arr[arr.length-1];
	var sta = false;
	
	for( i = 0 ; i < type.length ; i++ ){
		if(type[i] == img_format){
			sta = true;
		}
	}
	
	return sta;
}


/**
*	check video format
*/
function check_video_format(path)
{
	var arr = String(path).toLowerCase().split(".");
	var img_format = arr[arr.length-1];
	
	if(img_format == "flv"){
		return true;
	}else{
		return false;
	}
}


/**
*
*/
function checkeng(fieldname, val) 
{
     var str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-." //กำหนดอักษรอังกฤษส่วนนี้ครับ
     var valOK = true;
    
     for (i=0; i<val.length & valOK; i++){
           valOK = (str.indexOf(val.charAt(i))!= -1)
     }
    
     if (!valOK) {
           alert(fieldname+" use english, ( _ ), ( - ) or ( . ) only !!! ")
           return false
     } 
	 return true
} 


/**
* check this field isn't email format
*/
function emailCheck(emailStr) 
{
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	
	if (matchArray==null) {
		alert("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	
	var user=matchArray[1];
	var domain=matchArray[2];
	
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("Ths username contains invalid characters.");
			return false;
		}
	}
	
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			return false;
		}
	}
	
	if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		return false;
	}
	
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
				return false;
			}
		}
		return true;
	}
	
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("The domain name does not seem to be valid.");
			return false;
		}
	}
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("The address must end in a well-known domain or two letter " + "country.");
		return false;
	}
	
	if (len<2) {
		alert("This address is missing a hostname!");
		return false;
	}
	
	return true;
}