/* open popup window to center */
function popupWindowCenter(url,winName,w,h,sb,rs) {
	self.window.name="main";
	var leftPos = (screen.width)  ? parseInt((screen.width-w)/2) : 0;
	var topPos  = (screen.height) ? parseInt(((screen.height-h)/2)-30) : 0;
	var property = 'width='+w+',height='+h+',left='+leftPos+',top='+topPos+',toolbar=0,location=0,directories=0,menubar=0,status=0,scrollbars='+sb+',resizable='+rs;
	winName = window.open(url,winName,property);
	self.onBlur = winName.focus();
}

/* open popup window to top-left-corner */
function popupWindowTopLeft(url,winName,w,h,sb,rs) {
	var property = 'width='+w+',height='+h+',left=0,top=0,toolbar=0,location=0,directories=0,menubar=0,status=0,scrollbars='+sb+',resizable='+rs;
	winName = window.open(url,winName,property);
	self.onBlur = winName.focus();
}