function visible(){
	vitesseIE=20;
	vitesseFF=60;
	if(document.getElementById) {
		cur=document.getElementById("imageID");
		if(document.all){
			cur.filters.alpha.opacity++;
			if (cur.filters.alpha.opacity==100)
				return;
			else
				setTimeout("visible()",vitesseIE);
		}
		else{
			i=parseFloat(cur.style.getPropertyValue("-moz-opacity"));
			i+=parseFloat(0.1);
			cur.style.setProperty("-moz-opacity", i, "");
			if (i>=1)
				return;
			else
				setTimeout("visible()",vitesseFF);
		}
	}
}
function invisible(){
	vitesseIE=20;
	vitesseFF=60;
	if(document.getElementById) {
		cur=document.getElementById("imageID");

		if(document.all){
			cur.filters.alpha.opacity--;
			if (cur.filters.alpha.opacity==0)
				return;
			else
				setTimeout("invisible()",vitesseIE);
		}
		else{
			i=parseFloat(cur.style.getPropertyValue("-moz-opacity"));
			i-=parseFloat(0.1);
			cur.style.setProperty("-moz-opacity", i, "");
			if (i<=0)
				return;
			else
				setTimeout("invisible()",vitesseFF);
		}
	}
}