function onhover(obj_id, hover) {
  
  var vClassName = document.getElementById(obj_id + "a").className);  
  if(vClassName != "navtab1_sel" && vClassName != "navtab2_sel" && vClassName != "navtab2_sel") {
    if(hover == 1) {   
      document.getElementById(obj_id).style.backgroundImage = "url('res/tabcentersel.png')";
      document.getElementById(obj_id).style.color = "#292929";
      document.getElementById(obj_id + "a").style.backgroundImage = "url('res/tableftsel.png')";
      document.getElementById(obj_id + "b").style.backgroundImage = "url('res/tabcentersel.png')";
      document.getElementById(obj_id + "c").style.backgroundImage = "url('res/tabrightsel.png')";  
    }
    else {
      document.getElementById(obj_id).style.backgroundImage = "url('res/tabcenter.png')";
      document.getElementById(obj_id).style.color = "#FFFFFF";
      document.getElementById(obj_id + "a").style.backgroundImage = "url('res/tableft.png')";
      document.getElementById(obj_id + "b").style.backgroundImage = "url('res/tabcenter.png')";
      document.getElementById(obj_id + "c").style.backgroundImage = "url('res/tabright.png')";
    }
  }
}
//-----------------------------------------------------------------------------