Can you please advise me why the following Javascript function works in Firefox,Opera and Netscape but I get "Error:The marshaled interface data packet(OBJREF) has an invalid or unknown format."

It seems very basic! What am I missing?

code

function OpenSite()
{var newwindow;
newwindow=window.open(SiteN,'name');
if (window.focus) {newwindow.focus()}
}

/code

SiteN is a global variable carrying the url.