function openVR(url, w, h) {
	displayWidth  = (w==undefined)?window.screen.availWidth:w;
	displayHeight = (h==undefined)?window.screen.availHeight:h;
	window.open(url,"subwin", "left=0, top=0, width="+displayWidth  +", height="+displayHeight+" location=no, menubar=no");
}

function closeVR() {
	window.close();
}