js改变embed标签src值的方法

var tabv = document.getElementById("f_tabv");
var tabva = tabv.getElementsByTagName("a");
var tabcv = document.getElementById("f_tab_cv");
tabcv.innerHTML = '<EMBED src="abc.wmv" autostart="true"
width="545" height="325" type="video/x-ms-asf"></EMBED>';
for(var i=0; i<tabva.length; i++){
 tabva[i].onclick=function(){
 var href1 = this.getAttribute("href");
 var href2 = '<EMBED src="'+href1+'" autostart="true"
 width="545" height="325" type="video/x-ms-asf"></EMBED>';
 tabcv.getElementsByTagName("embed")[0].style.display="none";
 tabcv.innerHTML="";
 tabcv.innerHTML=href2;
 for(i=0; i<tabva.length; i++){
  tabva[i].className='';
 }
 this.className = "act";
 return false;
 }
}