怎么用JS动态改变这个值 。。。

Question

function   Playflv(url) 
{ 
document.getElementById( "FlvPlay ").movie   =   
"http://bbs.we54.com/we54/movie/play.swf?frameid=27&effectid=22&streamName=url "; 
} 把movie.value换成movie

Answer 1

url写在外边:
function   Playflv(url) 
{ 
document.getElementById( "FlvPlay ").movie.value   =   
"http://bbs.we54.com/we54/movie/play.swf?frameid=27&effectid=22&streamName="+url; 
} 

Answer 2

function Playflv(url) 
{ 
document.getElementById("Play").value =  
"http://bbs.we54.com/we54/movie/play.swf?frameid=27&effectid=22&streamName="+url; 
} 
<OBJECT   id=FlvPlay   
..... 
              <PARAM NAME= "movie"  VALUE= "/movie/play.swf?streamName=aaa" id="Play"> 
.....                                                                                                                                 
    </OBJECT>