Which version of Vegas are you using?

The current versions (since 13) are Magix versions. Sony purchased VEGAS at version 4 and sold it at version 13.

You mentioned using javascript. While that will certainly work, most examples you will see today are written in C#. Here's how you can go through the markers in c#.

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using ScriptPortal.Vegas;

namespace Test_Script
{
    public class Class1
    {
        public Vegas myVegas;

        public void Main(Vegas vegas)
        {
            myVegas = vegas;

            foreach (Marker myMarker in myVegas.Project.Markers)
            {
                //Process "myMarker"
            }
        }
    }
}

public class EntryPoint
{
    public void FromVegas(Vegas vegas)
    {
        Test_Script.Class1 test = new Test_Script.Class1();
        test.Main(vegas);
    }
}

You might also want to take a look at my new tutorials over at www.jetdv.com. So far I've covered what you need to write scripts in Vegas, how to go through the tracks and events on the timeline, how to do debugging with breakpoints, and would welcome requests and guidance on what topics need to be covered. Future topics already include splitting a stereo event into two mono events, creating a script that has a form, and selecting a region (very similar to markers).

You might also take a look at Excalibur which has a "Split at Markers" tool built-in.