this.blankwin = function(){
  var hostname = window.location.hostname;
  hostname = hostname.replace("www.","").toLowerCase();
  var a = document.getElementsByTagName("a");   
  this.check = function(obj){
    var href = obj.href.toLowerCase();
    return (href.indexOf("http://")!=-1 && href.indexOf(hostname)==-1) ? true : false;              
  };  
  this.set = function(obj){
            var href = obj.href;
            obj.onclick = function(){ if(confirm("Do you wanne leave this page?")) {
              return true;
            } 
              history.go(0);
              return false;
            };
            obj.target = "_blank";
            obj.className = obj.className + " blank";
            obj.rel = "nofollow";
    };
    for (var i=0;i<a.length;i++){
        if(check(a[i])) set(a[i]);
    };      
  }; 
  this.addEvent = function(obj,type,fn){
        if(obj.attachEvent){
            obj['e'+type+fn] = fn;
            obj[type+fn] = function(){obj['e'+type+fn](window.event );}
            obj.attachEvent('on'+type, obj[type+fn]);
        } else {
            obj.addEventListener(type,fn,false);
        };
    };
    addEvent(window,"load",blankwin);