Unfortunately, there is no mechanism to exclude a script (i.e. unless the script is targeting IE, in which case go to ramblex / karim79 answer).
But ... you can change your script to check a global variable (yes, I know a sigh) that - when set - stops the script. Something along the line:
// wrap your nice script in an anonymous function (function(document, undefined) { if ( window.ie6 === true ) return; ..... })(document);
Now enable and enable the global variable with the conditional tag, for example:
Et voila.
aefxx source share