media的在网页中的声音控制?????????

[wchunge]

在网上找到的脚本如下
var p_Obj="none";
function movevol(m_Obj)
{

p_Obj = m_Obj;

pX = parseInt(document.all(p_Obj).style.left)-event.x;
try {
if(((pX+event.x)>415)&&((pX+event.x)<500))
document.all(Mouse_Obj).style.left=pX+event.x;
}
catch(Exception e) {
document.wlriteln(e.getMessage());
}

}

function c_col()
{
document.all.WMPlay.Volume=((Layer2.style.left.slice(0,3)-415)/27)*100;
}
<td width=60>
<div id="Layer2" style="position:absolute;left:expression((document.body.clientWidth-200)/2)"><img name="Mouse_Obj" id="Mouse_Obj" onmousedown="movevol('Layer2')" onmouseup="c_col();" src="/radio/images/btn_sound_guage.gif" border=0 alt="音量"></div>
</td>
为可不能移动.请各们朋友帮我看一下

[flyskytoday]

http://community.csdn.net/Expert/topic/3359/3359021.xml?temp=.6182062
里面有音量控制的原理