var windowCounter = 0;

function newWindow(url, width, height) {
	windowCounter++;
	width += 20;
	height += 30;
	var myPos = (screen) ? ',left=' + parseInt((screen.width-width)/2) + ',top=' + parseInt((screen.height-height)/2) : '';
	var myWin = window.open(url, 'myWin' + windowCounter, 'width=' + width + ',height=' + height + ',menubar=0,location=0,resizable=0,scrollbars=0,toolbar=0' + myPos);
	myWin.focus();
	return myWin;
}