function openCenteredWindow(url, pWidth, pHeight, pArgs) {
	var sDWidth = pWidth;
	var sDHeight = pHeight;
	var sWidth = screen.availWidth;
	var sHeight = screen.availHeight;
	var sTop = (sHeight - sDHeight) / 2;
	var sLeft = (sWidth - sDWidth) / 2;
	var sParms = 'top=' + sTop + ',left=' + sLeft + ',width=' + sDWidth + ',height=' + sDHeight;
	if( pArgs == null) {
		sParms += ',resizable,scrollbars';
	} else {
		sParms += ',' + pArgs;
	}
	var sDate = new Date();
	var sWinName = '' + sDate.getTime();
	var sPopupWin = window.open(url, sWinName, sParms);
	sPopupWin.focus();
}