// JavaScript Document

var selectedOptions = [];
function countSelected(select,maxNumber){
   for(var i=0; i<select.options.length; i++){
     if(select.options[i].selected && !new RegExp(i,'g').test(selectedOptions.toString())){
        selectedOptions.push(i);
     }

     if(!select.options[i].selected && new RegExp(i,'g').test(selectedOptions.toString())){
      selectedOptions = selectedOptions.sort(function(a,b){return a-b});  
       for(var j=0; j<selectedOptions.length; j++){
         if(selectedOptions[j] == i){
            selectedOptions.splice(j,1);
         }
       }
     }

     if(selectedOptions.length > maxNumber){
      var throwAlert = true;
        select.options[i].selected = false;
        selectedOptions.pop();
     }  
   }            

     if(throwAlert == true){
        alert('Sie dürfen maximal '+maxNumber+' Branchen auswählen!!');
        document.body.focus();
     }
}