function YaZoomSlider(){
    this.YSLIDERLENGTH = 60;
    this.MAXZOOM = 17;

    this.onAddToMap = function (map, position){
        var that=this;
        this.map = map;
        this.position = position || new YMaps.ControlPosition(YMaps.ControlPosition.TOP_RIGHT, new YMaps.Size(10, 10));

        this.container = document.createElement("div");
        this.container.className = 'mg-map-plugin-scale';

        this.plusbtn = document.createElement("div");
        this.plusbtn.className = 'mg-map-plugin-scale-plus';
        this.plusbtn.onclick = function(){
            that.map.setZoom(that.map.getZoom() + 1);
        }
        this.container.appendChild(this.plusbtn);

        this.knobcont = document.createElement("div");
        this.knobcont.className = 'mg-map-plugin-scale-runnerPlace';
        this.knobcont.id = 'ya-mg-map-plugin-scale-runnerPlace-id';
        this.container.appendChild(this.knobcont);

        this.knob = document.createElement("div");
        this.knob.className = 'mg-map-plugin-scale-runner';
        this.knobcont.appendChild(this.knob);

        this.minusbtn = document.createElement("div");
        this.minusbtn.className = 'mg-map-plugin-scale-minus';
        this.minusbtn.onclick = function(){
            that.map.setZoom(that.map.getZoom() - 1);
        }
        this.container.appendChild(this.minusbtn);

        this.position.apply(this.container);

        YMaps.Events.observe(map, map.Events.Update, function(a) {that.setSlider(a.getZoom())});

        this.setSlider(map.getZoom())

        jQuery(this.container).appendTo(this.map.getContainer());

        jQuery( this.knob ).draggable({ containment: jQuery("#ya-mg-map-plugin-scale-runnerPlace-id"), drag : function(event, ui){ that.setZoom(ui.position.top); } });
    }

    this.onRemoveFromMap = function () {
        this.container.remove();
        this.container = this.map = null;
    }

    this.setSlider = function(zoom) {
        if(zoom > 0){
            var top = (this.YSLIDERLENGTH) - Math.round((this.YSLIDERLENGTH/this.MAXZOOM*zoom));
        } else {
            var top = (this.YSLIDERLENGTH);
        }
        this.knob.style.top = top+"px";
    }

    this.setZoom = function(top) {
        var z=this.MAXZOOM - Math.round(top*this.MAXZOOM/this.YSLIDERLENGTH);
        this.map.setZoom(z);
    }
}