帮忙看下这段javascript代码

[yukihh]

在什么条件下它会调用ERR_Noneplayer这个变量

<SCRIPT LANGUAGE=javascript>
<!--
function SetFileName()
{
var ReadyStatus=new Array(4);
var i=0;

for (i=0;i<4;i++)
ReadyStatus[i]=false;

if (typeof(parent.frames["chromewint"])!="undefined")
{
if (parent.frames["chromewint"].document.readyState=="complete" )
ReadyStatus[0]=true;
}

if (typeof(parent.frames["chromewinl"])!="undefined")
{
if (parent.frames["chromewinl"].document.readyState=="complete" )
ReadyStatus[1]=true;
}

if (typeof(parent.frames["chromewinr"])!="undefined")
{
if (parent.frames["chromewinr"].document.readyState=="complete" )
ReadyStatus[2]=true;
}

if (typeof(parent.frames["chromewinb"])!="undefined")
{
if (parent.frames["chromewinb"].document.readyState=="complete" )
ReadyStatus[3]=true;
}

if (ReadyStatus[0] && ReadyStatus[1] && ReadyStatus[2] && ReadyStatus[3])
{
window.clearInterval(timeid);
try
{

VodPlayer.SetVolume(50);
VodPlayer.Source="<%=url%>";
VodPlayer.SetWantErrors(true);
VodPlayer.SetEnableContextMenu(false);
readystatechange();

}
catch (e)
{
window.alert(ERR_NonePlayer);
top.window.close();
}
}
delete ReadyStatus;
}

var timeid;

timeid=window.setInterval("SetFileName()",100,"javascript");
//-->
</SCRIPT>