// Pick a random li from a ul with class=random

var Randomize = {
   init: function() {
       var uls = document.getElementsByTagName('ul');
       for(x=0,l=uls.length;x<l;x++) {
          if(uls[x].className.indexOf('random')>-1) {
             Randomize.dorandom(uls[x]);
          }
       }
   },
   
   dorandom: function(ul) {
      var lis = ul.getElementsByTagName('li')
      var low = 0;
      var high = lis.length - 1;
      var r = Math.floor(Math.random() * ( 1 + high - low ) + low );
      lis[r].className = 'selected';
   }
   
}