desap = new Object();
tiempo = new Object();


function efecto(object, transparencia, transicion, velocidad){
if (!document.all)
return
    if (object != "[object]"){ 
        setTimeout("efecto("+object+","+transparencia+","+transicion+","+velocidad+")",0);
        return;
    }
        
    clearTimeout(tiempo[object.sourceIndex]);
    
    diff = transparencia-object.filters.alpha.opacity;
    direction = 1;
    if (object.filters.alpha.opacity > transparencia){
        direction = -1;
    }
    velocidad=Math.min(direction*diff,velocidad);
    object.filters.alpha.opacity+=direction*velocidad;

    if (object.filters.alpha.opacity != transparencia){
        desap[object.sourceIndex]=object;
        tiempo[object.sourceIndex]=setTimeout("efecto(desap["+object.sourceIndex+"],"+transparencia+","+transicion+","+velocidad+")",transicion);
    }
}