// JavaScript Document
function zoom(arg){
		var depart = document.carte_zoom.src.length - 6;
		var newSrc = document.carte_zoom.src.substr(depart,2);
		
		if(arg=="in"){
			newSrc ++;
		}else{
			newSrc --;
		}

		if((1 <= newSrc) && (newSrc <= 4)){
			if(newSrc < 10){
				newSrc = "0"+newSrc;
			}
			newSrc = "_images/zoom/"+newSrc+".jpg";
			document.carte_zoom.src = newSrc;
		}
	}