How to check in sidebar (forum blocks) if user is logged in?

[wman]

Thanks - the following worked:

if (vB::$vbulletin->userinfo[userid])
{
	echo "logged in";
}
else
{
	echo "not logged in";
}

But the text is displayed at the top of the page, before any other output, instead of in the sidebar. I assume the "echo" is the culprit; do I have to add the text to some output variable instead?