The problem with this hybrid mix of modern and ancient is that you miss out on most of the benefits of using the modern code because of the ancient code that it is mixed with.
The start of the body of the page displays a message to any IE8 users telling them their browser is out of date and to upgrade. Unfortunately the only people still using IE8 are those running it on obsolete versions of Windows where the option to upgrade to a more recent Microsoft browser is not available. Those using obsolete versions of windows who know what a browser is are using an alternative to IE anyway so the only people this message is actually telling to upgrade are those who can't.
Of course looking at the code leaves me wondering why that antiquated script code is there at all since the previous line loads an equivalent script from a common repository while the Netscape 4 script loads a local copy of what should be the same script. Interestingly that local copy isn't even included in the template library.