Weird behavior with JS hyperlink

[Ineffable]

I use Javascript hyperlinks in my HTML5 outputs, which open a new window and initiate a search on one of our other cross-domain websites. I essentially append the part number they click on onto a URL with a JSP search page on the other end.

In Safari, this works fine. However, in IE and FF on W7, the page in my output that contains the links goes blank and simply displays

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[object]

when the user returns to it after viewing the resulting new window and search results. Refreshing the browser page brings things back to normal.

I did a little snooping using the Developer Tools in IE 10 (I also tried IE 9, 8, and 7 - same behavior), and there is an error being thrown that points to a line in MadCapUtilities.js, which reads:

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        if (otherUrl.IsAbsolute) {
            throw new MadCap.Exception(-1, "Cannot combine two absolute paths.");
        }

Can anyone shed any light, please?