JS errors with ExternalInterface call

programming flash
1

I am seeing some JavaScript errors on my page and tracked it down to my external interface calls from Flash. Everything is working fine but the page looks pretty bad with JS errors reported in the status bar.

Using the ms debug tool i tracked it down to this line that is giving the error (url call removed to protect clients identity).

try { document.getElementById(“Marquee”).SetReturnValue(__flash__toXML(set728x90Ads(INSERTURLHERE)) ); } catch (e) { document.getElementById(“Marquee”).SetReturnValue("<undefined/>"); }

My call looks like such;
if (ExternalInterface.available) {
ExternalInterface.call(“set728x90Ads”, adCall728x90);
}

As I said, the js function does run. Just reporting errors.

Any help would be appreciated.