var decalage_haut = 34;
var mon_slider = 'slider';
var ma_pub = 'boite_pub';
var autorisation = true;

function show_ad(mode) {
	
	if(mode == 'auto' || (mode == 'manu' && autorisation == true)) {
		autorisation = false;
		var pos_v = document.getElementById(mon_slider).offsetTop;
		
		if(pos_v < decalage_haut) {
			
			var new_pos = pos_v + 1;
			document.getElementById(mon_slider).style.top = new_pos+'px';
			setTimeout('show_ad("auto")', 30);
		}
		else setTimeout('hide_ad()', 4500);
	}
}

function hide_ad() {
	
	var hauteur_elem = document.getElementById(ma_pub).offsetHeight+2;
	var pos_v = document.getElementById(mon_slider).offsetTop;
	
	if(pos_v > -hauteur_elem) {
		
		var new_pos = pos_v - 1;
		document.getElementById(mon_slider).style.top = new_pos+'px';
		setTimeout('hide_ad()', 50);
	}
	else autorisation = true;
}

function set_opaque(opacity) {
	
	if(opacity < 100) {
		
		opacity = parseInt(opacity) + 1;
		
		if(navigator.appName == 'Netscape') {
			// Firefox
			document.getElementById('boite_pub').style.setProperty('opacity', opacity/100, '');
		}
		else if(navigator.appName == 'Microsoft Internet Explorer') {
			// Internet Explorer
			document.getElementById('boite_pub').style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity="'+opacity+'")';
		}
		
		setTimeout('set_opaque("'+opacity+'")', 5);
	}
}