function isValid(dataStr){
	var validStr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
	for (var j = 0; j < dataStr.length; j++){
		if (validStr.indexOf(dataStr.charAt(j)) < 0) 
			return false;
	}
	return true; 
}

function isNumber(numberStr){
	var validStr = "1234567890";
	
	for (var j = 0; j < numberStr.length; j++){
		if (validStr.indexOf(numberStr.charAt(j)) < 0) 
			return false;
	} 
	return true; 
}

function isPhone(phoneNumber) 
{ 
	var validStr = "1234567890-";
	
	for (var j = 0; j < phoneNumber.length; j++){
		if (validStr.indexOf(phoneNumber.charAt(j)) < 0) 
			return false;
	} 
	return true; 
} 

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

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

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

	if (mailAddress.indexOf(at,(lat+1))!=-1){
		return false;
	}
	
	if (mailAddress.substring(lat-1,lat)==dot || mailAddress.substring(lat+1,lat+2)==dot){
		return false;
	}

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