//########################################
//## script copyright fusio.net         ##
//## developed for efriends.ie		    ##
//## by remi [at] fusio<.>net           ##
//########################################

function validate_uname(form_name)
{
	if (form_name.username.value == "")
	{
		alert("Please choose a NickName for use on the site.");
		form_name.username.select();
		return false;
	}
	
	if (form_name.username.value.length < 4)
	{
		alert("Your NickName must be more than 4 characters long!");
		form_name.username.select();
		return false;
	}

	if (form_name.username.value.length > 40)
	{
		alert("Your NickName must be no more than 40 characters in length!");
		form_name.username.select();
		return false;
	}	
	
	
	if (form_name.username.value != "")
	{
		var string2check = form_name.username.value
		if (!AlphaNum(string2check))
		{
			alert("Sorry, Your NickName must only contain alphanumeric characters (abc.. 123..). Use a dash or an underscore instead of a space");
			form_name.username.focus();
			return false;
		}
	}	
	
	return true;

}

function AlphaNum(string2check)
{
	// allow ONLY alphanumeric keys, no symbols or punctuation
	// this can be altered for any "checkOK" string you desire
	var checkOK = "_-ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
	var checkStr = string2check;
	var allValid = true;
	for (i = 0;  i < checkStr.length;  i++)
	{
		ch = checkStr.charAt(i);
		for (j = 0;  j < checkOK.length;  j++)
		if (ch == checkOK.charAt(j))
		break;
		if (j == checkOK.length)
		{
			allValid = false;
			break;
		}
	}
	if (!allValid)
	{
		return (false);
	}
	else
	{
		return (true);
	}

}