function buttonover( buttonname , Layer) {
  if(ns4 && Layer && document[Layer].document[ buttonname ].src.search("-down") == -1) {
    document[Layer].document[ buttonname ].src = "../../images/bullet_over.gif";
  }
  
  else {
 
    if (document.images && document[ buttonname ].src.search("_down") == -1) {
	
	  if (document.images && document[ buttonname ].src.search("bullet") == -1) {
        document[ buttonname ].src = eval( buttonname + "over.src" );
	  }
	  
	  else document[ buttonname ].src = "../../images/bullet_over.gif";
	  
	}
  }
}
  
  
function buttonup ( buttonname , Layer) {
  if(ns4 && Layer && document[Layer].document[ buttonname ].src.search("_down") == -1) {
    document[Layer].document[ buttonname ].src = "../../images/bullet.gif";
  }
  
  else {
  
    if (document.images && document[ buttonname ].src.search("_down") == -1) {
	
	  if (document.images && document[ buttonname ].src.search("bullet") == -1) {
        document[ buttonname ].src = eval( buttonname + "up.src" );
	  }
	  
	  else document[ buttonname ].src = "../../images/bullet.gif";

    }
  }
}  
  
  function buttondown ( buttonname ) {
    nr=0;
    while (document.images[nr]) {

      if(document.images[nr].src.search("_down")!=-1) {
	    source = document.images[nr].src.replace("_down.gif", ".gif");	
	    document.images[nr].src = source;
	  }
      nr++
    }
    document[ buttonname ].src = eval( buttonname + "down.src" );
}