Hidden register button Trouble

[SsJ8Darkness]

I am having trouble with this mod I am making and I dont understand why it is happening..

this is what I am doing:

add to phpinclude:

//regbutton
$regbutton="";
if ($bbuserinfo['userid']<"1") {
$regbutton="<a href="register.php?s=$session[sessionhash]&action=signup"><img src="darkblue/top_register.gif" alt="Registration is free!" border="0"></a>";
}
//end

and adding $regbutton to the header instead of:

<a href="register.php?s=$session[sessionhash]&action=signup"><img src="darkblue/top_register.gif" alt="Registration is free!" border="0"></a>

and I am getting Parse error: parse error in global.php(274) : eval()'d code on line 10