function ch_banner_code(name, params) {
  var url;
  if ( params && params['partner'] ) {
    url = 'http://par'+params['partner']+'.chobots.com/';
  } else if (params && params['url']) {
    url = params['url'];
  } else {
    url = 'http://www.chobots.com';
  }
  
  var data=name.match(/([0-9]+)_([0-9]+)/);
  var w=data[1], h=data[2];;

  return '<object width="'+w+'" height="'+h+'" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" id="google_flash_obj"\n'+ 'classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000">\n'+
     '<param value="http://www.chobots.com/game/resources/banners/'+name+'.swf" name="movie">\n'+
     '<param value="high" name="quality">\n'+
     '<param value="never" name="AllowScriptAccess">\n'+
     '<param value="opaque" name="wmode">\n'+
     '<param value="url='+url+'" name="FlashVars">\n'+
     '<embed width="'+w+'" height="'+h+'" pluginspage="http://www.macromedia.com/go/getflashplayer" allowscriptaccess="never" type="application/x-shockwave-flash" flashvars="url='+url+'" wmode="opaque" id="google_flash_embed" src="http://www.chobots.com/game/resources/banners/'+name+'.swf">\n'+
   '</object>';
}

function ch_write_banner(name, params) {
  document.write(ch_banner_code(name, params));
}

function ch_random_banner(size_w, size_h) {
  
}