Right click menu in gridview and index selected

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Javascript

ASP.NET4

I Have this code in JavaScript with asp.net

I use Right Click Menu and it Work done but i need to get index selected row to use

in code behind in my project

this my code :

<pre><script type="text/javascript" src="JS/ContextMenu.js"></script>

<script type="text/javascript">
var oCustomContextMenu = null;
    var oBase = null; 


   var Thevalue= null; 
window.onload = function()
{
    oBase = document.getElementById("GridView1");


    var Arguments = {
        Base: oBase,
        Width: 200,
        FontColor: null,
        HoverFontColor: null,
        HoverBackgroundColor: null,
        HoverBorderColor: null,
        ClickEventListener: OnClick
    };

    oCustomContextMenu = new CustomContextMenu(Arguments); 

    oCustomContextMenu.AddItem('Images/ei0019-48.gif', 'MyIndex', false, 'MyIndex');


}

var OnClick = function(Sender, EventArgs)
{
    switch(EventArgs.CommandName)
    {
        case 'MyIndex':
            alert('The Index :');
            break;

    }

    oCustomContextMenu.Hide();   
}

window.onunload = function(){ oCustomContextMenu.Dispose(); }
</script>

I need only get the Index value of selected row

What I have tried:

i try :

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
   {


       if (e.Row.RowType == DataControlRowType.DataRow)
       {
            e.Row.Attributes.Add("onclick", "javascript:rowno(" + e.Row.RowIndex + ")");


       }
   }

with this :

<script type="text/javascript">
       function rowno(rowindex) {
           alert(rowindex);
       }
   </script>

and it work done But I can not merge it with the Right click menu