Runtime error: class not registered

When attempting to open links from IE6 I am getting runtime error Class not registered. I open debuging and it shows me this:
var remote=null;
function rs(n,u,w,h,x) { args="width="+w+",height="+h+",resizable=yes,scrollbars=yes,status=0";
remote=window.open(u,n,args);
if (remote != null) {
if (remote.opener == null)
remote.opener = self;
}
if (x == 1) { return remote; }
}

where remote=window.open(u,n,args); is the error {break}

dialog box says class not registered

Any ideas... I am new to debugging. Thanks for any help. Chris Staunton