First of all, we would need to see the javascript file that you've linked to the page.
Secondly, I recommend downloading a Mozilla browser (Mozilla, Firefox, Netscape, etc.) and using the javascript debugger that's built into that. It will usually give you a lot better information than the one in IE.
Finally, I would recommend adding a semi-colon to the end of each code snippet on that line. It's never a good idea to leave your javscript code-lines open-ended. The semi-colon is what closes the line.
Code:
<A HREF="javascript:void(0);" onClick="showCalendar(QAForm.DateField1,'mm/dd/yyyy','Choose date');">