请大侠们帮我看看吧！为什么innerHTML的值不会改变啊！

Question

   
     var flashpaper = new Array();
flashpaper[0] = "../images/01.swf";
flashpaper[1] = "../images/02.swf";
flashpaper[2] = "../images/03.swf";
var flashpapername ="";
var innerHTML     =  '\<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase= "http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="619" height="395" title="kechengkejian">\
                    <param name="movie"  value="'+flashpapername+'">\
                    <param name="quality" value="high">\
                    <embed  src="'+flashpapername+'" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="619" height="395" ></embed>\
                  </object>';
              
function changeFlash1()
{   
flashpapername=flashpaper[0];
alert(flashpapername);
document.getElementById("flashpaperplay").innerHTML=innerHTML;
alert(innerHTML); 

}
function changeFlash2()
{
flashpapername=flashpaper[1];
document.getElementById("flashpaperplay").innerHTML=innerHTML;

}
function changeFlash3()
{
flashpapername=flashpaper[2];
document.getElementById("flashpaperplay").innerHTML=innerHTML;

}[code=JScript]当发生单击事件时执行changeFlash函数，但是用alert调试发现innerHTML里面的值没有改变，也就是说innerHTML字符串变量里的flashpapername变量还是默认是为空！这是怎么回事啊！！请大侠指教

Answer 1

var flashpaper = new Array();
    flashpaper[0] = "../images/01.swf";
    flashpaper[1] = "../images/02.swf";
    flashpaper[2] = "../images/03.swf";
var flashpapername ="";
function createInnerHTML(fpname){
    var innerHTML =  '\<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase= "http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="619" height="395" title="kechengkejian">\
                    <param name="movie"  value="'+flashpapername+'">\
                    <param name="quality" value="high">\
                    <embed  src="'+fpname+'" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="619" height="395" ></embed>\
                  </object>';
   return innerHTML;
}function changeFlash(index){
    document.getElementById("flashpaperplay").innerHTML=createInnerHTML(flashpaper[index]);
}
function changeFlash1(){
    changeFlash(1);
}
function changeFlash2(){
    changeFlash(2);
}
function changeFlash3(){
   changeFlash(3);
}

Answer 2

<script>
var flashpaper = new Array();
    flashpaper[0] = "../images/01.swf";
    flashpaper[1] = "../images/02.swf";
    flashpaper[2] = "../images/03.swf";
var flashpapername ="";
function setHtml(flashpapername) {
    var innerHTML = '\<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase= "http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="619" height="395" title="kechengkejian">\
                    <param name="movie"  value="' + flashpapername + '">\
                    <param name="quality" value="high">\
                    <embed  src="' + flashpapername + '" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="619" height="395" ></embed>\
                  </object>';
    return innerHTML;
}      
              
function changeFlash1()
    {   
        flashpapername=flashpaper[0];
        alert(flashpapername);
        document.getElementById("flashpaperplay").innerHTML = setHtml(flashpapername);
        alert(document.getElementById("flashpaperplay").innerHTML); 
        
    }
function changeFlash2()
    {
        flashpapername=flashpaper[1];
        document.getElementById("flashpaperplay").innerHTML=innerHTML;
        
    }
function changeFlash3()
    {
        flashpapername=flashpaper[2];
        document.getElementById("flashpaperplay").innerHTML=innerHTML;
        
    }
    </script>
    <div id="flashpaperplay"></div>
    <input id="aa" onblur="changeFlash1()" />
    

Answer 3

得到innerHTML之后，先innerHTML = "";