// developed by Stanislav Melnichuk (IndiSign Planet), email: indi2000@pisem.net, ICQ: 251052470
function ValidateEmail(email) {
  if (email=="") {
    return true; 
  }

  re = /^[\w-\.]+@([\w-]+\.)+([a-z]{2,4})$/i ;
	
	trim_email = email.replace(/(^\s*)|(\s*$)/g, "");
	
  if(re.test(trim_email)) {
    return true;
  } else {
    alert("Invalid E-mail. Please re-enter");
    return false;
  }

}

function ValidateURL(url) {
	if (url=="") return true;
	re = /^http:\/\/[\S]+$/i ;
	if(re.test(url)) return true;	 
		else { alert("Invalid URL. Please re-enter");  return false;	}
}

function ValidateLogin(text) {
	if (text=="") return true;
	re = /^([A-Za-z0-9_-]*)$/i ;
	return re.test(text);
}

function ValidatePWD(text) {
	if (text=="") return true;
	re = /^([A-Za-z0-9_-]*)$/i ;
	return re.test(text);
}