function ModPeriode(id,interfOnglet)
{
//alert('id: '+id+'interfOnglet: '+interfOnglet);
	ladate=new Date();
  newsdate=new Date();
  offset=1000*60*60*24;
  newsdate.setTime(ladate.getTime()+offset);
	if (id==0){ 
		offset*=8;
    newsdate.setTime(ladate.getTime()-offset);
    document.getElementById('datedebut'+interfOnglet).value = ecritDate(newsdate);
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==1){ 
		offset*=30;
    newsdate.setTime(ladate.getTime()-offset);
     document.getElementById('datedebut'+interfOnglet).value = ecritDate(newsdate);
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==2){ 
		offset*=92;
    newsdate.setTime(ladate.getTime()-offset);
     document.getElementById('datedebut'+interfOnglet).value = ecritDate(newsdate);
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==3){ 
     document.getElementById('datedebut'+interfOnglet).value = "01/01/2007";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==4){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/2005";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==5){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/2004";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==6){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/2003";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==7){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/2000";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
	else if (id==8){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/1990";
   	document.getElementById('datefin'+interfOnglet).value = "31/12/1999";
	}
	else if (id==9){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/1980";
   	document.getElementById('datefin'+interfOnglet).value = "31/12/1989";
	}
	else if (id==10){ 
    document.getElementById('datedebut'+interfOnglet).value = "01/01/1980";
   	document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
	}
}

function ecritDate(objet){
  var s_jour="";
  var s_mois="";
  var s_anne="";
  s_jour+=objet.getDate();
  s_mois+=objet.getMonth()+1;
  s_anne+=objet.getYear();
  if (s_anne<1000) s_anne=1900+parseInt(s_anne);
  if(s_jour.length==1) s_jour='0'+s_jour;
  if(s_mois.length==1) s_mois='0'+s_mois;
  aa=parseInt(s_anne);  
  if(aa>=1900 && aa<=1950)
    aa=aa+100;
   chainedate=s_jour+"/"+s_mois+"/"+aa; //s_anne
  return(chainedate);
}

function initdate(interfOnglet){
	ladate=new Date();
  newsdate=new Date();
  offset=1000*60*60*24;
  newsdate.setTime(ladate.getTime()+offset);
	offset*=8;
  newsdate.setTime(ladate.getTime()-offset);
   document.getElementById('datedebut'+interfOnglet).value = ecritDate(newsdate);
   document.getElementById('datefin'+interfOnglet).value = ecritDate(ladate);
}

function initcalendar(interfOnglet){
    Calendar.setup({
        inputField     :    "datedebut"+interfOnglet,    
        ifFormat       :    "%d/%m/%Y",      
        button         :    "triggerdebut"+interfOnglet,  
        align          :    "Tl",          
        singleClick    :    true
    });
    Calendar.setup({
        inputField     :    "datefin"+interfOnglet,    
        ifFormat       :    "%d/%m/%Y",      
        button         :    "triggerfin"+interfOnglet,  
        align          :    "Tl",         
        singleClick    :    true
    });
}

function convDate(ladate){
  var retstr="";
  retstr =ladate.substring(6,10);
  retstr=retstr+ladate.substring(3,5);
  retstr=retstr+ladate.substring(0,2);
  return retstr;
}