if (document.images) {
	tb_postup       = new Image();
	tb_postup.src   = "/i/dl/topic/sc/kit/tb_post.gif";
	tb_postdown     = new Image() ;
	tb_postdown.src = "/i/dl/topic/sc/kit/tb_post_ov.gif";

	tb_seeallup       = new Image();
	tb_seeallup.src   = "/i/dl/topic/sc/kit/tb_seeall.gif";
	tb_seealldown     = new Image() ;
	tb_seealldown.src = "/i/dl/topic/sc/kit/tb_seeall_ov.gif";
}
function buttondown( buttonname ) {
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname ) {
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}