Stopping A Switch Function?

I have a switch function with four cases: each case executes a sequence of six css changes.How to stop it, if the viewer wants to abort, by choose another menu option?I've done a trawl, and the closest I've come to finding something which could be adapted is from this site,by MattEvans, a while back, buit it had to do with a loop in the function to be stopped:create a public/global variable called "stopped", set it to false when you start the loop.inside the loop put:

if(stopped){
break;
}

then when you press "cancel" set the stopped variable to true .So, maybe something like

var=stopped
function wrapSwitch() {
if(stopped){ break; }

[code]....