Wanted: Workaround To Javascript:show(...); Instead Of OnClick ForNetscare 4

I was calling a function in a js file from an image onClick event, but
someone still using Netscape 4 (!) complained that it didn't work. I
read that img onClick doesn't work in Netscape 4, so swithced it to
"javascript:show(...);" and the code works, but I read in this group
that it was not wise to do that, here's the working version, using the
not recommended approach:

<a href="javascript:show('art_2.jpg',÷»',ò^');" target="_self">

I'd appreciate any suggetions that will let me call the "show" function
from an onClick image event that will work in most IE/Netscape 4+ browsers.