function callMe() {
	var tel		=	document.getElementById("TelCB").value;
	if (! Numeric(tel) || tel.length != 10) {
		alert("Le numéro de téléphone indiqué n'est pas valide \n Veillez indiquez les 10 chiffres ainsi : 0102030405\n");
		return false;
	} else {
		document.getElementById("IF1").src = "http://www.123mutuelle.com/routines/callCli.php?TEL="+tel;	
	}		
}

function Numeric(strString)
   //  check for valid numeric strings 
   {
   var strValidChars = "0123456789.-";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
         }
      }
   return blnResult;
   }