set initial position as %

        }else if(this.options.position.length){
            if(typeof(this.options.position[1]) == 'string') {
                    var topFinal = this.options.position[1];
            } else {
                    var top = $value(this.options.position[1]) + $value(this.options.offsetTop);
                    var topFinal = (container_dimensions.height <= viewport_dimensions.height) ? (this.options.constrainToViewport ? Math.max(0,Math.min(viewport_dimensions.height - (container_dimensions.height),top)) : top) + 'px' : 0;
            }
            if(typeof(this.options.position[0]) == 'string') {
                    var leftFinal = this.options.position[0];
            } else {
                    var left = $value(this.options.position[0]) + $value(this.options.offsetLeft);
                    var leftFinal = (container_dimensions.width <= viewport_dimensions.width) ? (this.options.constrainToViewport ? Math.max(0,Math.min(viewport_dimensions.width - (container_dimensions.width),left)) : left) + 'px' : 0;
            }
            this.container.setStyle({top: topFinal,left: leftFinal});
        }