//	Open window in center
function openWindow(url, mywidth, myheight) 
{
	var width = (mywidth == undefined) ? 1000 : mywidth;
    var height =  (myheight == undefined) ? 680 : myheight;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    var windowFeatures = "scrollbars=yes, width=" + width + ",height=" + height + ",status,resizable,left=" + left + ",top=" + top + "screenX=" + left + ",screenY=" + top;
    myWindow = window.open(url, "subWind", windowFeatures);
}