How can I remove a single overlay in Openlayers 3.3.0? -

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i creating overlays in mapping application need refresh every 5 seconds. having difficulties removing stale overlay map using code below. map.removeoverlay method not seem working correctly. stacking of overlays visibly apparent after few iterations.

using map.getoverlays().clear() removes stale overlay, however, removes overlays not desired. assistance appreciated.

window.setinterval(function() {  $.ajaxsetup({ mimetype: "text/plain" });   $.getjson('json/data.json', function(data) {       $.each(data.item, function(key, val) {          var storename = this.name;          var storelocation = this.location;          var storelatitude = this.latitude;          var storelongitude = this.longitude;            $.each(val.tasks, function(i, j){              var taskname = this.name;              var taskstate = this.state;                if (taskstate == "open") {                 var taskgeometry = ol.proj.transform([storelongitude,storelatitude], 'epsg:4326', 'epsg:3857');                 function createcircleoutoverlay(position) {                 var elem = document.createelement('div');                 elem.setattribute('class', 'circleout');                  return new ol.overlay({                     element: elem,                     position: position,                     positioning: 'center-center'                 });             }                 var taskoverlay = createcircleoutoverlay(taskgeometry);                 map.removeoverlay(taskoverlay);                 map.addoverlay(taskoverlay);                 }            });       });      });  }, 5000); 

            var taskoverlay = createcircleoutoverlay(taskgeometry);             map.removeoverlay(taskoverlay);

the problem trying remove new overlay , not old one. have store reference overlay openlayers can remove map. like:

var currentoverlay = null; window.setinterval(function() {  $.ajaxsetup({ mimetype: "text/plain" });                 // ...                 if (currentoverlay === null) {                   map.removeoverlay(currentoverlay);                 }                 currentoverlay = createcircleoutoverlay(taskgeometry);                 map.addoverlay(currentoverlay);                // ...

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