function ad(kaisou) {
  var r ;
  var xx = new Array( ) ;

  xx.push( '<iframe src="'+ kaisou + 'redirect0.html" border="0" width="100%" height="400" scrolling="no" margin="0" frameborder="0"></iframe>' ) ;

  r = Math.floor( Math.random( ) * xx.length ) ;
  document.write( xx[r] ) ;

// alert(xx[r]);
}