Prevent Javascript from being executed twice

Question

I have a script that I am developing that creates a sliding button type effect. Five div\'s are situated next to eachother each with a link. When one of those DIVS are click

Answer 1

(function() {
var mutex = false;

    function mnuClick(x){
        if (!mutex) {
           mutex = !mutex;

           /* all code here ...   */

           mutex = !mutex; /* this statement should go into animation callback */
        }

    }

})();

mantain a state through a variable so you cannot click more than once until code has fully executed