var i = 0;
var j = i+1;
	
function create_champ(){
	if(i<1){
		document.getElementById('champs').innerHTML += "<div id='img_"+i+"' style='display:block'>"+
		"Image "+j+" : <input type='file' name='img_"+i+"' id='jour_"+i+"' /></div>";
	}
	else{
		document.getElementById('champs').innerHTML += "<div id='img_"+i+"' style='display:block'>"+
		"Image "+j+" : <input type='file'  name='img_"+i+"' id='img_"+i+"' />"+
		"<input type='button' value='-' onClick='remove_champ("+i+")' />"+
		"</div>";
	}
	i++;
	j++;
}
	
function remove_champ(i){
	var parent = document.getElementById("img_"+i).parentNode;
	parent.removeChild(document.getElementById("img_"+i));
}