function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=1,menubar=0,resizable=1,width=800,height=700,left = 240,top = 70');");
}

function prepareTargetBlank(){
   var className = 'external';
   var as = document.getElementsByTagName('a');
   for(i=0;i<as.length;i++){
      var a = as[i];
      r=new RegExp("(^| )"+className+"($| )");
      if(r.test(a.className)){
         a.onclick = function(){
            window.open(this.href);
            return false;
         }
      }
    }
}
	   
window.onload = prepareTargetBlank;