Voici ce que j'ai pondu au final, si qqun a plus efficace...
[CODE]<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script type="text/javascript" language="javascript">
var separNumTel = '-';
//trigger holders
var wasplusAdded = false;
var wasparleftAdded = false;
var wasparrightAdded = false;
function addSepNumTel(event, obj) {
var keyCode = event.keyCode?event.keyCode:event.which;
//evite de perdre la position du focus sur les touches backspace, prec, suiv, suppr
if(keyCode != 8 && keyCode != 37 && keyCode != 39 && keyCode != 46) {
var value = obj.value;
var trueValue; //this will hold the true number count
var valueTmp = '';
var count = 0;
// holders
var plusAdded = "";
var parleftAdded = "";
var parrightAdded = "";
//first Remove all special char + - ()
trueValue = value.replace(/[-()+]+/g,"");
//determine if the user has aad one of the following + ,( ,)
if(value.indexOf('+') != -1) {
trueValue = trueValue.replace(/\++/g,"");
plusAdded="+";
wasplusAdded = true;
} else {
//incase item was deleted reset trigger to false
wasplusAdded = false;
}
if(value.indexOf('(') != -1) {
trueValue = trueValue.replace(/\)+/g,"");
parleftAdded = "(";
wasparleftAdded = true;
} else {
//incase item was deleted reset trigger to false
wasparleftAdded = false;
}
if(value.indexOf(')') != -1) {
trueValue = trueValue.replace(/\(+/g,"");
parrightAdded = ")";
wasparrightAdded = true;
} else {
//incase item was deleted reset trigger to false
wasparrightAdded = false;
}
var i = 0;
if(wasplusAdded) {
valueTmp = plusAdded;
if(trueValue.length > 0) {
valueTmp += trueValue.charAt(i++);
}
if(trueValue.length > 1) {
valueTmp += trueValue.charAt(i++);
valueTmp += separNumTel;
count ++;
}
}
if(wasparleftAdded) {
valueTmp += parleftAdded;
if(trueValue.length > i) {
valueTmp += trueValue.charAt(i++);
}
if(wasparrightAdded) {
valueTmp += parrightAdded;
if(wasplusAdded) {
count ++;
}
}
}
while(i < trueValue.length) {
if(i != 0 && (i - count)%2 == 0) {
valueTmp += separNumTel;
valueTmp += trueValue.charAt(i++);
} else {
valueTmp += trueValue.charAt(i++);
}
}
obj.value = valueTmp;
}
}
function verifTel(event) {
var authorizedChar = eval('/[' + separNumTel + '+()0123456789]/');
var keyCode = event.keyCode?event.keyCode:event.which;
var char = String.fromCharCode(keyCode);
//on autorise backspace, enter,ctrl, shift, alt, ..., prec, suiv, suppr
if(keyCode > 20 && keyCode != 37 && keyCode != 39 && keyCode != 46 && !authorizedChar.test(char)) {
alert('Les caract\350res autoris\351s sont : +()' + separNumTel + '0123456789');
return false;
}
return true;
}
</script>
</head>
<body>
<input type="text" name="phone" value="" onKeyPress="return verifTel(event);" onKeyUp="return addSepNumTel(event, this);"/>
<p>01-23-45-67-89<br /> +33-1-23-45-67-89<br /> +33-(0)1-23-45-67-89<br/>(0)1-23-45-67-89</p>
</body>
</html>[/CODE]