function getCal(year, month, prev, next){
		var mois = document.getElementById('calmonth');
		mois = parseInt(mois.value);
		//alert(mois);
		
		var annee = document.getElementById('calyear');
		annee = parseInt(annee.value);
		//alert(annee);
		
		var data = '';
		
		//changement dannee
		if(year == 1){
			//annee suivante
			if(next == 1){
				var newyear = annee+1;
				//alert(newyear);
				data = "newyear="+newyear;
			}
			else{ //annee precedente
				var newyear = annee-1;
				//alert(newyear);
				data = "newyear="+newyear;
			}
		}
		else{ data = "newyear="+annee; }
		
		//changement de mois
		if(month == 1){
			//mois suivant
			if(next == 1){
				if(mois == 12) var newmonth = 1;
				else var newmonth = mois+1;
				//alert(newmonth);
				data += "&newmonth="+newmonth;
			}
			else{ //mois precedent
				if(mois == 1) var newmonth = 12;
				else var newmonth = mois-1;
				//alert(newmonth);
				data += "&newmonth="+newmonth;
			}
		}
		else{ data += "&newmonth="+mois; }
		
		if(data != ''){ //si on a des modifs a faire
			//alert(data);
			var co;
			if (window.XMLHttpRequest) co = new XMLHttpRequest();
			else if (window.ActiveXObject) co = new ActiveXObject('Microsoft.XMLHTTP');
			else{
				alert('JavaScript : votre navigateur est trop vieux !');
				return;
			}	
			co.open('POST','inc/calendar.inc.php',true);
			co.onreadystatechange = function(){
				
				if(co.readyState == 1){ }
				if (co.readyState == 4){
					if (document.getElementById){
							document.getElementById("calendrier").innerHTML = co.responseText;
					}
				}
			}
			co.setRequestHeader('Content-type','application/x-www-form-urlencoded');
			co.send(data);
		}
}