var obj=0;
var pos=0;
var mouv;
var defil_ok=true;
var largeur = 620;

function defil(type,tot) {
	clearInterval(mouv);
	f_d = document.getElementById('f_defil_droite');
	f_g = document.getElementById('f_defil_gauche');
	if(type=='plus') {
		if(obj<largeur*(tot-1)) {			
			obj+=largeur;
			mouv = setInterval('mouv_bck('+obj+')',25);
		}
		if(obj==(largeur*(tot-1))) {
			f_d.style.visibility = 'hidden';
		}
		f_g.style.visibility = 'visible';
	}
	if(type=='moins') {
		if(obj>0) {
			obj-=largeur;
			mouv = setInterval('mouv_bck('+obj+')',25);
		}
		if(obj==0) {
			f_g.style.visibility = 'hidden';
		}
		f_d.style.visibility = 'visible';
	}	
}	
function mouv_bck(obj) {
	var c = document.getElementById('cont_image');
	pos += (obj-pos)/8;
	if(Math.abs(obj-pos)<2) {
		pos=obj;
		clearInterval(mouv);
	}
	bj = pos*(-1);		
	c.style.marginLeft = bj+'px';
}