Script to arrange artboard in grid

var clms = 5; 
var space_x = 20;
var space_y = 20;
clms = prompt("Columns", clms, "Input");
if (clms)
    {
    clms = Number(clms);
    var arts = new Array();
    var w = 0;
    var h = 0;
    for (var i = 0; i < activeDocument.layerSets.length; i++)
        {
        var r = new ActionReference();      
        r.putProperty(stringIDToTypeID("property"), stringIDToTypeID("artboardEnabled"));          
        r.putIdentifier(stringIDToTypeID("layer"), activeDocument.layerSets.id);      
    
        if (executeActionGet(r).getBoolean(stringIDToTypeID("artboardEnabled"))) 
            {
            var r = new ActionReference();      
            r.putProperty(stringIDToTypeID("property"), stringIDToTypeID("artboard"));          
            r.putIdentifier(stringIDToTypeID("layer"), activeDocument.layerSets.id);      
    
            var rect = executeActionGet(r).getObjectValue(stringIDToTypeID("artboard")).getObjectValue(stringIDToTypeID("artboardRect"));
    
            var l = rect.getDouble(stringIDToTypeID("left"));
            var t = rect.getDouble(stringIDToTypeID("top"));
            var r = rect.getDouble(stringIDToTypeID("right"));
            var b = rect.getDouble(stringIDToTypeID("bottom"));
    
            arts.push([activeDocument.layerSets, [l,t,r,b]]);
    
            var w1 = r-l;
            var h1 = b-t;
    
            if (w1 > w) w = w1;
            if (h1 > h) h = h1;
            }
        }
    var rows = Math.floor(arts.length/clms);
    if (rows*clms < arts.length) ++rows;
    var i = 0;
    for (var y = 0; y < rows; y++)
        {
        var pos_y = y * (h + space_y);
        for (var x = 0; x < clms; x++)
            {
            if (i >= arts.length) break;
            activeDocument.activeLayer = arts[0];
            var pos_x = x * (w + space_x);
            move(pos_x-arts[1][0], pos_y-arts[1][1])
            i += 1;
            }
        }
    }
///////////////////////////////////////////////////////////////////////////
function move(x, y)
    {
    try {
        var d = new ActionDescriptor();
        var r = new ActionReference();
        r.putEnumerated(stringIDToTypeID("layer"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum"));
        d.putReference(stringIDToTypeID("null"), r);
        var d1 = new ActionDescriptor();
        d1.putUnitDouble(stringIDToTypeID("horizontal"), stringIDToTypeID("pixelsUnit"), x);
        d1.putUnitDouble(stringIDToTypeID("vertical"), stringIDToTypeID("pixelsUnit"), y);
        d.putObject(stringIDToTypeID("to"), stringIDToTypeID("offset"), d1);
        executeAction(stringIDToTypeID("move"), d, DialogModes.NO);
        }
    catch (e) { throw(e); }
    }