function trim (sInString)
{
  sInString = sInString.replace( /^\s+/g, "" );// strip leading
  return sInString.replace( /\s+$/g, "" );// strip trailing
}

function IsNumeric (sText)
{
	var ValidChars = "0123456789,";
	var IsNumber = true;
	var Char;

	for (i = 0; i < sText.length && IsNumber == true; i++)
	{
		Char = sText.charAt(i);
		if (ValidChars.indexOf(Char) == -1)
		{
			IsNumber = false;
		}
	}

	return IsNumber;
}

function checkMail(email)
{
	var x = email;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (filter.test(x)) return true;
	else return false;
}

function checkUsername(str)
{
	var x = str;
	var filter  = /[a-zA-Z0-9_\.\-]/;
	if (filter.test(x)) return true;
	else return false;
}