[OpenLayers-Users] how to remove selected marker

[wrap map]

hey all,

function CreateNewMarker() {
    markerName = document.getElementById("markerName").value;
    if (document.getElementById("markerName").value.length == 0)
    alert("You cannot leave markername empty");
    else {
        markers = new OpenLayers.Layer.Markers(markerName);
        map.addLayer(markers);
        add();

    }
}

now i want to remove marker that i added as the definite layer, i tried to
make layer delete but that is not working for me.

i tired as:

markerName.removeLayer()

or how can i remove selected layer which i can get the name from text box
and delete them
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