function playvideo(vn,vw,vh) {
  vname = vn;
  vwin=open('av/plvwin.htm','vwin','width='+vw+',height='+vh+',left='+(window.screen?(screen.width/2)-vw/2:0)+',top='+(window.screen?(screen.height/2)-vh/2:0)+',resizable=yes').focus();
}