var myWindow;

function openCenteredWindow(url) {
    var width = 1032;
    var height = 654;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "width=" + width + ",height=" + height + ",status=1,resizable=1,location=0,menubar=0,directories=0,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
    if (myWindow) {
    	myWindow.close();
    }
    myWindow = window.open(url, "subWind" + new Date().getTime(), windowFeatures);
}