function validateFormOnSubmit(theForm) {
//alert("ValidateForm");	
var reason = "";

    reason += validateLetters(theForm.fterme);
//  reason += validateUsername(theForm.fterme);
//  reason += validatePassword(theForm.pwd);
//  reason += validateEmail(theForm.email);
//  reason += validatePhone(theForm.phone);
//  reason += validateEmpty(theForm.from);
      
  if (reason != "") {
    alert("ERREUR!\n\nCorriger votre terme de recherche:\n\n" + reason);
    return false;
  }

  return true;
}
validateEmpty ( )

function validateLetters(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Red'; 
        error = "Entrer un terme de recherche non nul.\n"
        return error;
    }
    
    $maString = trim(fld.value);
    $maString = trim($maString);    
//    alert($maString);
//    alert($maString.length);
    $i=1;
    while($i<=$maString.length) {
//		alert($maString.substr($i-1,1));
		if (($maString.substr($i-1,1) < "0") | ($maString.substr($i-1,1) > "z"))  {
        	fld.style.background = 'Red'; 
        	error = "Votre terme ("+$maString+") contient une lettre invalide! Ne pas utiliser d'accent ni d'espace."
//        	alert(error);
        	return(error);
    	}
		if (($maString.substr($i-1,1) < "A") & ($maString.substr($i-1,1) > "9"))  {
        	fld.style.background = 'Red'; 
        	error = "Votre terme ("+$maString+") contient une lettre invalide! Ne pas utiliser d'accent ni d'espace."
//        	alert(error);
        	return(error);
    	}
		if (($maString.substr($i-1,1) < "a") & ($maString.substr($i-1,1) > "Z"))  {
        	fld.style.background = 'Red'; 
        	error = "Votre terme ("+$maString+") contient une lettre invalide! Ne pas utiliser d'accent ni d'espace."
//        	alert(error);
        	return(error);
    	}
		$i++;
	}

    return error;   
}

function validateEmpty(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'Red'; 
        error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;   
}

function validateUsername(fld) {
//	alert("validateUsername : "+fld.value);
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Red'; 
        error = "Entrer un terme de recherche!";
    } else if ((fld.value.length < 4) || (fld.value.length > 24)) {
        fld.style.background = 'Red'; 
        error = "Choisir un terme de recherche valide, entre 4 et 24 lettres!";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Red'; 
        error = "Aucun caractère spécial n'est accepté!\nUtiliser seulement des lettres et des chiffres,\npas d'espace et pas de lettres accentuées!";
    } else {
        fld.style.background = 'White';
    } 
    return error;
}


function validatePassword(fld) {
    var error = "";
    var illegalChars = /[\W_]/; // allow only letters and numbers 
 
    if (fld.value == "") {
        fld.style.background = 'Red';
        error = "You didn't enter a password.\n";
    } else if ((fld.value.length < 7) || (fld.value.length > 15)) {
        error = "The password is the wrong length. \n";
        fld.style.background = 'Red';
    } else if (illegalChars.test(fld.value)) {
        error = "The password contains illegal characters.\n";
        fld.style.background = 'Red';
    } else if (!((fld.value.search(/(a-z)+/)) && (fld.value.search(/(0-9)+/)))) {
        error = "The password must contain at least one numeral.\n";
        fld.style.background = 'Red';
    } else {
        fld.style.background = 'White';
    }
   return error;
}   

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = 'Red';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Red';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Red';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validatePhone(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Red';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Red';
    } else if (!(stripped.length == 10)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Red';
    } 
    return error;
}