function   alpha_high(this_obj)    
  {if(this_obj.filters.alpha.opacity>40)    
  {this_obj.filters.alpha.opacity-=5;    
  }else    
  {clearInterval(this_obj.highint);    
  this_obj.highint=null;    
  }    
  }    
  function   alpha_low(this_obj)    
  {if(this_obj.filters.alpha.opacity<100)    
  {this_obj.filters.alpha.opacity+=5;    
  }else    
  {clearInterval(this_obj.lowint);    
  this_obj.lowint=null;    
  }    
  }