Js parent page and child pages are not displayed at the same time

The example of this article describes the js parent page and child page not at the same time display method, can achieve a page open, the parent page DISABLE, after the child page closed, the parent page ENABLE. Share with you for your reference. Specific methods are as follows:

function onNewClick()

{

    var url = "VesselScheduleNEW.aspx";

    if (null!=newWin && newWin.closed) newWin=null;    

    if (null==newWin)     newWin=window.showModalDialog(url,"newwin","dialogWidth=1000px;dialogHeight=400px;help:no;center:yes;resizable:no;status:no;scroll:no");    

    if(newWin == "OK")

    {

        window.location.reload();

    }

}