function echeck(str) 
{

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    return false
		 }

 		 return true					
}
function checkUserID(formName)
{
	var myform  = document.forms[formName];
	var userName= myform.username.value;
	var divObj  = "errUsername";
	var url     = "https://titook.net/lib/process.php?task=verifyUserName&userName="+userName;
    
	if("" == userName)
	{
		document.getElementById(divObj).innerHTML = "Null value!";
        return;
	}
	else
	{
		verifyUserID(url,divObj);
	}
}
function checkEmail(formName)
{
	var myform  = document.forms[formName];

	var email   = myform.email.value;
	var divObj  = "errEmail";
	var url     = "https://titook.net/lib/process.php?task=verifyEmail&email="+email;
	if("" == email)
	{
		document.getElementById(divObj).innerHTML = "Null value!";
		return;
	}
	if(false == echeck(email))
	{
		document.getElementById(divObj).innerHTML = "The email is invalid!";
        return;
	}
	else
	{
		verifyEmail(url,divObj);
	}
}