Check url/link before visiting?

[DSP]

Does anyone know of checking with javascript whether a link target (or url) exists/is valid before the user clicks it?
I was hoping that I could create a true/false function that if the url would return 404 I could take some action in the script, but haven't found a way of doing so

tia

Dave

 

[801119]

I once saw a script that could do this... I found it at

http://www.javascriptsource.com,

but the site has changed a bit since the last time I was there... try searching there! My codes look like something a kid wrote
I have absolutely no idea what I am talking about
Somehow I still manage to make it work