Depends on what browser you are using.
With MSIE, you want to do this:
Click on TOOLS menu.
Click on INTERNET OPTIONS menu item.
Click on ADVANCED tab.
*UNCHECK* "disable script debugging (Internet Explorer)
*CHECK* "display a notification about every error"
OK
Note that you do *NOT* want to leave that "display a notification" checked when you are doing casual Internet browsing or it will drive you buggy with all the errors there are on many many HTML pages.
You should also then download a script debugger of some kind. You can use Visual Web Developer Express Edition (free) or the MS Script Debugger.
If you are using Firefox, then make sure you have downloaded and installed the FireBug plugin for Firefox. Read the instructions for using it for catching and displaying errors. It's far easier and more friendly than any MSIE solution, but for basic scripting you can probably get away with what I suggested above for MSIE.
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