Mine

function EffectManager() {    function construct() {        this.setOpacity = function( el, opacity ) {            opacity = ( opacity == 100 ) ? 99.999 : opacity;            el.style.filter         = 'alpha(opacity:' + opacity + ')';            el.style.KHTMLOpacity   = opacity/100;            el.style.MozOpacity     = opacity/100;            el.style.opacity        = opacity/100;            el.emOpacity            = opacity;        }; // end of 'setOpacity()'        this.fadeIn = function( el, maxOpacity, callback ) {                    el.emOpacity = el.emOpacity || 0;            el.emOpacity += 5;            if ( el.emOpacity <= maxOpacity ) {                Effect.setOpacity(el, el.emOpacity);                el.emOpacity = el.emOpacity + 5;                window.setTimeout(function() {                    Effect.fadeIn(el, maxOpacity, callback);                }, 10);            }                        else {                try { callback(); } catch(e) {};            }        }; // end of 'fadeIn()'        this.fadeOut = function( el, minOpacity, callback ) {                    el.emOpacity = el.emOpacity || 100;            el.emOpacity = el.emOpacity - 5;            if ( el.emOpacity >= minOpacity ) {                Effect.setOpacity(el, el.emOpacity);                el.emOpacity -= 5;                window.setTimeout(function() {                    Effect.fadeOut(el, minOpacity, callback);                }, 10);            }                        else {                try { callback(); } catch(e) {};            }                }; // end of 'fadeOut()'            }    return new construct();};var Effect = new EffectManager();