Create Rectangular Selection

PS Extendscript: SelectRectangle.jsx

//Change app units to pixels so the selection below will perform correctly
app.preferences.rulerUnits = Units.PIXELS;

//Selects a 100px by 100px rectangle.
selectRect(0,0,100,100)

function selectRect(top, left, right, bottom)
{
    app.activeDocument.selection.deselect()
    // =======================================================
    var id1 = charIDToTypeID( "setd" );
    var desc1 = new ActionDescriptor();
    var id2 = charIDToTypeID( "null" );
    var ref1 = new ActionReference();
    var id3 = charIDToTypeID( "Chnl" );
    var id4 = charIDToTypeID( "fsel" );
    ref1.putProperty( id3, id4 );
    desc1.putReference( id2, ref1 );
    var id5 = charIDToTypeID( "T   " );
    var desc2 = new ActionDescriptor();
    var id6 = charIDToTypeID( "Top " );
    var id7 = charIDToTypeID( "#Pxl" );
    desc2.putUnitDouble( id6, id7, top );
    var id8 = charIDToTypeID( "Left" );
    var id9 = charIDToTypeID( "#Pxl" );
    desc2.putUnitDouble( id8, id9, left );
    var id10 = charIDToTypeID( "Btom" );
    var id11 = charIDToTypeID( "#Pxl" );
    desc2.putUnitDouble( id10, id11, bottom );
    var id12 = charIDToTypeID( "Rght" );
    var id13 = charIDToTypeID( "#Pxl" );
    desc2.putUnitDouble( id12, id13, right );
    var id16 = charIDToTypeID( "Rctn" );
    desc1.putObject( id5, id16, desc2 );
    executeAction( id1, desc1, DialogModes.NO );
}