function init_carrousel(carid, nbvis, nbpix, step)
{
	var nbItem = $('#' + carid + ' div.prod_bloc').size();
	var carWidth = (nbItem * nbpix);
	var wndWidth = (nbvis * nbpix);
	$('#' + carid + ' div.carrousel_slider').css({'width' : carWidth + 'px'});
	
	// Suppression des boutons de défilement si pas assez de blocs
	if (nbItem <= nbvis) {
		$('#' + carid + ' div.btn_next').removeClass('btn_next').addClass('btn_vide');
		$('#' + carid + ' div.btn_previous').removeClass('btn_previous').addClass('btn_vide');
	}
	
	$('#'+ carid + ' div.btn_previous').click(function() {
		var max = $('#' + carid + ' div.carrousel_slider').width();
		var value = $('#' + carid + ' div.carrousel_slider').css('left').substr(0,$('#' + carid + ' div.carrousel_slider').css('left').length - 2);
		value = value*1 + nbpix*step;
		if (value < wndWidth-max*1) {value = wndWidth-max*1;}
		if (value > 0) {value = 0;}
		$('#' + carid + ' div.carrousel_slider').animate({left: value + 'px'},500);
	});
	
	$('#'+ carid + ' div.btn_next').click(function() {
		var max = $('#' + carid + ' div.carrousel_slider').width();
		var value = $('#' + carid + ' div.carrousel_slider').css('left').substr(0,$('#' + carid + ' div.carrousel_slider').css('left').length - 2);
		value = value*1 - nbpix*step;
		if (value < wndWidth-max*1) {value = wndWidth-max*1;}
		if (value > 0) {value = 0;}
		$('#' + carid + ' div.carrousel_slider').animate({left: value + 'px'},500);
	});
}