function open_jobs(obj){
    
    //val = document.body.scrollTop;   
    
    if(document.getElementById){
      var el = document.getElementById(obj);
      var ar = document.getElementById("master_jobs").getElementsByTagName("span"); 
        if(el.style.display != "block"){ 
          for (var i=0; i<ar.length; i++){
            if (ar[i].className=="sub_jobs"){
              ar[i].style.display = "none";
            }
          }
          el.style.display = "block";
        }else{
          el.style.display = "none";
        }
    }
    
    //document.body.scrollTop = val;
}