function emailCheck (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 "  - Votre adresse mail semble incorrecte (verifiez les @ et .)\n"
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	
	// See if "user" is valid 
	if (user.match(userPat)==null) {
	    // user is not valid
	    return "  - Le nom du destinataire dans votre adresse mail ne semble pas valide.\n"
	}
	
	/* 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 "  - L'adresse IP dans votre adresse mail est invalide.\n"
		    }
	    }
	    return true
	}
	
	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		return "  - Le nom de domaine de votre adresse mail ne semble pas valide.\n"
	}
	
	/* 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>4) {
	   // the address must end in a two letter or three letter word.
	   return "  - L'adresse mail doit finir par un domaine en trois lettres ou un pays en deux lettres.\n"
	}
	
	// Make sure there's a host name preceding the domain.
	if (len<2) {
	   return "  - Il manque le nom de domaine dans votre adresse mail.\n"
	}
	
	// If we've gotten this far, everything's valid!
	return "";
}
//  End

function CheckDate(d) 
{
      // Cette fonction vérifie le format JJ/MM/AAAA saisi et la validité de la date.
      var amin=1900;   // année mini
      var amax=2050;   // année maxi
      var separateur="/";   // separateur entre jour/mois/annee
      var j=(d.substring(0,2));
      var m=(d.substring(3,5));
      var a=(d.substring(6));
      var ok=1;

      if ( ((isNaN(j))||(j<1)||(j>31)) && (ok==1) ) {
         ok=0;
      }
      if ( ((isNaN(m))||(m<1)||(m>12)) && (ok==1) ) {
         ok=0;
      }

      if ( ((d.substring(2,3)!=separateur)||(d.substring(5,6)!=separateur)) && (ok==1) ) {
         ok=0;
      }
      if (ok==1) {
         var d2=new Date(a,m-1,j);
         j2=d2.getDate();
         m2=d2.getMonth()+1;
         a2=d2.getYear();
	   if (a2<2000){
		a2="19" + a2;
	   }
         if ( (j!=j2)||(m!=m2)||(a!=a2) ) {
            ok=0;
         }
      }
      return ok;
}

function aide_saisie_date(d)
{
	// Retourne une date saisie au format JJMMAA ou JJMMAAAA au format JJ/MM/AAAA
	var sresult=d
	if  ((d.substring(2,3)!="/")&&(d.substring(5,6)!="/"))
		{
		if (d.length==6)
			{
		      var j=(d.substring(0,2));
	      	var m=(d.substring(2,4));
		      var a=(d.substring(4));
			if ( a<30)
				{
				sresult=j+"/"+m+"/20"+a;
				}
			else
				{
				sresult=j+"/"+m+"/19"+a;
				}
			}
	
		if (d.length==8)
			{
		      var j=(d.substring(0,2));
	      	var m=(d.substring(2,4));
		      var a=(d.substring(4));
			sresult=j+"/"+m+"/"+a;
			}
		}
	else
		{
		if (d.length==8)
			{
		      var j=(d.substring(0,2));
	      	var m=(d.substring(3,5));
		      var a=(d.substring(6));
			sresult=j+"/"+m+"/"+a;
			if ( a<30)
				{
				sresult=j+"/"+m+"/20"+a;
				}
			else
				{
				sresult=j+"/"+m+"/19"+a;
				}
			}
		}
	if (CheckDate(sresult)==0)
		{
		sresult=""
		}
	return sresult;
}


 function verif_heure(heure)
 {
  var heures;
  var minutes;
  var verif = heure.substring(2,3);
  if (verif == ":")
  {
    	 heures = heure.substring(0,2);
    	minutes = heure.substring(3,5);
    	if(isNaN(heures))
    		return "";
    	else
    	{	
    	  	if(isNaN(minutes))
    	  		return "";
    	  	else
  			return heure;
    	}
  }
  else
  {
    heures = heure.substring(0,2);
    minutes = heure.substring(2,4);
    if(isNaN(heures))
    	return "";
    else
    {
     	 if(isNaN(minutes))
     	 	return "";
     	 else
     	 {
     	  	if (heures>23)
     	  		return "";
     	  	if (minutes > 60)
     	  		return "";
     	  	if(heures.length == 1)
     	  		heures = "0" + heures;
     	  	if(minutes.length == 1)
     	  		minutes = "0" + minutes;
     	  		
     	 	var lheurecalcul = heures + ":" + minutes;
     	 	return lheurecalcul;
     	 }
    }
  }
  
 }