function isString(sString)
{
	if(sString.length > 0 && typeof(sString) == 'string')
	{
		return true;
	}
	else
	{
		return false;
	}
}

function isName(sName)
{
  var regName = /^[a-zA-Z\ δφόΔΦάιθΰκη-]*$/;
  if(regName.test(sName) == true)
  {
  	return true;
  }
  else
  {
  	return false;
  }
}

function isEMail(sEmail)
{
	var regEmail = /^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*\.([a-zA-Z]{2,4})$/;
	if(regEmail.test(sEmail) == true)
	{
		return true;
	}
	else
	{
		return false;
	}
}

function isNumber(sNumber)
{
	var regInt = /^[0-9]+$/;
	if (regInt.test(sNumber) == true)
	{
		return true;
	}	
	else
	{
		return false;
	}
}