function centerwin()
{
	var NS=document.all;
	if(!NS){
		self.moveTo((self.screen.width - self.outerWidth) / 2, (self.screen.height - self.outerHeight) / 2);
	}
	else {
		self.moveTo((self.screen.width-document.body.clientWidth) / 2, (self.screen.height-document.body.clientHeight) / 2);
	}
	window.focus();
}

function windowopencenter(url, name, width, height)
{
	return window.open(url, name, 'resizable=yes,scrollbars=yes,width='+width+',height='+height+',left='+((self.screen.width - width) / 2)+',top='+((self.screen.height - height) / 2));
}