function EstEmail (emailStr) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


/* Finally, let's start trying to figure out if the supplied address is
   valid. */

/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
        return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
          for (var i=1;i<=4;i++) {
            if (IPArray[i]>255) {

                return false
            }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {

    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="This address is missing a hostname!"
   return false
}

// If we've gotten this far, everything's valid!
return true;
}
//  End -->




// Renvoi Faux si le champ ne contient pas une date
function EstDate(Text_Input)
{
	var passe=true;
	var Tous_les_numeros = "0123456789";
	if (Text_Input.value.length!=10) {passe=false;};

	if (passe==true)
	{
     if ( Tous_les_numeros.indexOf(Text_Input.value.substring(0,1))=="-1" ) passe=false;
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(1,2))=="-1" ) passe=false;
	 if ( Text_Input.value.substring(2,3)!="-") passe=false;

	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(3,4))=="-1" ) passe=false;
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(4,5))=="-1" ) passe=false;
	 if ( Text_Input.value.substring(5,6)!="-") passe=false;
	 
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(6,7))=="-1" ) passe=false;
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(7,8))=="-1" ) passe=false;
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(8,9))=="-1" ) passe=false;
	 if ( Tous_les_numeros.indexOf(Text_Input.value.substring(9,10))=="-1" ) passe=false;

	 
	 if (passe==true)
	 {
	  if ( (Text_Input.value.substring(0,1)+Text_Input.value.substring(1,2))>31) passe=false;
	  if ( (Text_Input.value.substring(3,4)+Text_Input.value.substring(4,5))>12) passe=false;
	 }

	}
	return passe;
}

// Renvoi Faux si le champs autre chose que des point, virgule et numero 
function EstNombre(Text_Input) 
{
	var Tous_les_numeros = "0123456789.,"
	var passage = true;
	var temp;
	var pointvirg;
	pointvirg=0;
	for (var i=0; i<Text_Input.value.length; i++) 
	{
		temp = "" + Text_Input.value.substring(i, i+1);
		if (Tous_les_numeros.indexOf(temp) == "-1") passage=false;
		if ( (temp==".")||(temp==",") ) 
			{pointvirg=pointvirg+1;}
	}
	if (pointvirg>1) 
		{passage=false;}
	return passage;
}

// Renvoi Faux si le champs autre chose que des numero 
function EstEntier(Text_Input) 
{
	var Tous_les_numeros = "0123456789"
	var passage = true;
	var temp;
	for (var i=0; i<Text_Input.value.length; i++) 
	{
		temp = "" + Text_Input.value.substring(i, i+1);
		if (Tous_les_numeros.indexOf(temp) == "-1") passage=false;
	}
	return passage;
}


// Renvoi Faux si le champ contient un nombre égal a 0 (exemple: 00 ou 0000)
function EstNul(Text_Input)
{
	var zero=true;
	for (var i=0; i<Text_Input.value.length; i++) 
	{
		if (Text_Input.value.substring(i, i+1)!="0") zero=false;
	}
	return zero;
}


// Renvoi Vrai si le champ est vide ou contient autre chose qu'un nombre différent de 000...
function LetNulVide(Text_Input)
{
	if ( (!EstNombre(Text_Input))||(Text_Input.value=="")||(EstNul(Text_Input)) )
		{return true;} else {return false;};
}

function Radio_Check(radio)
{
	var Valid=false;
	if (radio.length) 
		{
		for (var i=0;i<radio.length;i++)
			{ if (radio[i].checked) Valid=true;}
		if (Valid==false) { return false;};
		}
	else {
	
		 if (!radio.checked) 
		 	{  return false;};
		};
		
	return true;

}