if(navigator.appName.indexOf("Microsoft") > -1){ 
document.write("<BGSOUND src=\"../midifile/cryatalmagic.mid\"  loop=\"infinite\" volume=\"0\">"); } 
else if(navigator.appName.indexOf("Netscape") > -1){ 
document.write("<embed src=\"../midifile/cryatalmagic.mid\" width=\"0\" height=\"0\" panel=\"0\" repeat=\"true\" autostart=\"true\" loop=\"true\">"); } 
else{ 
document.write("<embed src=\"../midifile/cryatalmagic.mid\" width=\"0\" height=\"0\" panel=\"0\" repeat=\"true\" autostart=\"true\" loop=\"true\">"); }