少しグーグルで考えた後、私は決断しました:ユーザーが
したがって、直接実装:
index.html-メイン
 < html > 
      
        
        
        
      
     < head > 
      
        
        
        
      
     < title >   </ title > 
      
        
        
        
      
     < script > 
      
        
        
        
      
     function openPage() 
      
        
        
        
      
     { 
      
        
        
        
      
     var newwin = window.open( 'bgsound.html' , 'ert' , 'scrollbars=0, resizable=0, titlebar=1, height=20, width=320' ); 
      
        
        
        
      
     newwin.blur(); //      
      
        
        
        
      
     } 
      
        
        
        
      
     </ script > 
      
        
        
        
      
     </ head > 
      
        
        
        
      
     < body onload ="openPage()" > 
      
        
        
        
      
     < a href ="otherpage.html" >       ,   ? </ a > 
      
        
        
        
      
     </ body > 
      
        
        
        
      
     </ html > 
      
        
        
        
      
     
      
        
        
        
      
     * This source code was highlighted with Source Code Highlighter . 
      
        
        
        
      
    
      
      
        
        
        
      
    
        
        
        
      
      
        
        
        
      
    
    < html >
< head >
< title > </ title >
< script >
function openPage()
{
var newwin = window.open( 'bgsound.html' , 'ert' , 'scrollbars=0, resizable=0, titlebar=1, height=20, width=320' );
newwin.blur(); //
}
</ script >
</ head >
< body onload ="openPage()" >
< a href ="otherpage.html" > , ? </ a >
</ body >
</ html >
* This source code was highlighted with Source Code Highlighter .
 < html > 
      
        
        
        
      
     < head > 
      
        
        
        
      
     < title >   </ title > 
      
        
        
        
      
     < script > 
      
        
        
        
      
     function openPage() 
      
        
        
        
      
     { 
      
        
        
        
      
     var newwin = window.open( 'bgsound.html' , 'ert' , 'scrollbars=0, resizable=0, titlebar=1, height=20, width=320' ); 
      
        
        
        
      
     newwin.blur(); //      
      
        
        
        
      
     } 
      
        
        
        
      
     </ script > 
      
        
        
        
      
     </ head > 
      
        
        
        
      
     < body onload ="openPage()" > 
      
        
        
        
      
     < a href ="otherpage.html" >       ,   ? </ a > 
      
        
        
        
      
     </ body > 
      
        
        
        
      
     </ html > 
      
        
        
        
      
     
      
        
        
        
      
     * This source code was highlighted with Source Code Highlighter .
      
      
        
        
        
      
    
        
        
        
      
      
        
        
        
      
    
     
      
        
        
        
      
    bgsoung.html-バックグラウンドミュージックのページ
 < html > 
      
        
        
        
      
     < head > 
      
        
        
        
      
     < title >   (    ) </ title > 
      
        
        
        
      
     < script > 
      
        
        
        
      
     <!-- 
      
        
        
        
      
     function player() 
      
        
        
        
      
     { 
      
        
        
        
      
     //    
      
        
        
        
      
     var isWin = navigator.userAgent.toLowerCase().indexOf( "windows" ) != -1; 
      
        
        
        
      
     if (isWin) 
      
        
        
        
      
     { 
      
        
        
        
      
     visitorOS= "Windows" ; 
      
        
        
        
      
     } 
      
        
        
        
      
     else 
      
        
        
        
      
     { 
      
        
        
        
      
     visitorOS= "Other" ; 
      
        
        
        
      
     } 
      
        
        
        
      
     
      
        
        
        
      
     var objTypeTag = "application/x-mplayer2" ; //  Windows 
      
        
        
        
      
     if (visitorOS != "Windows" ) { objTypeTag = "audio/mpeg" }; //    
      
        
        
        
      
     
      
        
        
        
      
     document .writeln( "<object data='sound.mp3' type='" + objTypeTag + "'>" ); 
      
        
        
        
      
     document .writeln( "<param name='filename' value='sound.mp3' />" ); 
      
        
        
        
      
     document .writeln( "<param name='autoplay' value='true'>" ); 
      
        
        
        
      
     document .writeln( "<param name='playcount' value='0'>" ); 
      
        
        
        
      
     document .writeln( "</object>" ); 
      
        
        
        
      
     document .close(); 
      
        
        
        
      
     } 
      
        
        
        
      
     // --> 
      
        
        
        
      
     </ script > 
      
        
        
        
      
     </ head > 
      
        
        
        
      
     < body > 
      
        
        
        
      
     < script > 
      
        
        
        
      
     player(); 
      
        
        
        
      
     </ script > 
      
        
        
        
      
     </ body > 
      
        
        
        
      
     </ html > 
      
        
        
        
      
     
      
        
        
        
      
     * This source code was highlighted with Source Code Highlighter .
      
      
        
        
        
      
    
        
        
        
      
      
        
        
        
      
    
    < html >
< head >
< title > ( ) </ title >
< script >
<!--
function player()
{
//
var isWin = navigator.userAgent.toLowerCase().indexOf( "windows" ) != -1;
if (isWin)
{
visitorOS= "Windows" ;
}
else
{
visitorOS= "Other" ;
}
var objTypeTag = "application/x-mplayer2" ; // Windows
if (visitorOS != "Windows" ) { objTypeTag = "audio/mpeg" }; //
document .writeln( "<object data='sound.mp3' type='" + objTypeTag + "'>" );
document .writeln( "<param name='filename' value='sound.mp3' />" );
document .writeln( "<param name='autoplay' value='true'>" );
document .writeln( "<param name='playcount' value='0'>" );
document .writeln( "</object>" );
document .close();
}
// -->
</ script >
</ head >
< body >
< script >
player();
</ script >
</ body >
</ html >
* This source code was highlighted with Source Code Highlighter .
otherpage.html-他のページ
 < html > 
      
        
        
        
      
     < head > 
      
        
        
        
      
     < title >   </ title > 
      
        
        
        
      
     </ head > 
      
        
        
        
      
     < body > 
      
        
        
        
      
     ! 
      
        
        
        
      
     < a href ="index.html" >  ? </ a > 
      
        
        
        
      
     </ body > 
      
        
        
        
      
     </ html > 
      
        
        
        
      
     
      
        
        
        
      
     * This source code was highlighted with Source Code Highlighter .
      
      
        
        
        
      
    
        
        
        
      
      
        
        
        
      
    
    < html >
< head >
< title > </ title >
</ head >
< body >
!
< a href ="index.html" > ? </ a >
</ body >
</ html >
* This source code was highlighted with Source Code Highlighter .
UPD
ユーザーの許可なしに音楽(音)を含めるのは非現実的であるという事実に注目します。