hi all, can any one say me that what does this piece of code ? and if that works or not ?

in the html source code we have :
.
.
.
<OBJECT ID="test" width=250 height=50 CLASSID="CLSID:10548230-1C12-11A1-8248-4a1d4f56a2aC"
codebase="http://www.mywebsite.com/loader.cab#version=1,0,0,2">
</OBJECT>
.
.
.

<SCRIPT LANGUAGE="javascript">
var ie4 = b_agent.indexOf("MSIE 4.0",0);
if (ie4 == -1)
{
if (!test.Version)
{
alert('!test version');
}
else
{
alert('test version !!!');
}
}

</SCRIPT>
what does test.version ? is it a method of javascript ? i could mail the full code too if it is
important. i needeed that check if the loader.cab file has been installed on the client computer
or not? and i looked some source code , till i found that above code, but i don't now exactly what
that source code does?

is there any another way that i could find that the cab file has been successfully installed on the client
computer?
plz help me as soon as possible , cause i need urgent help !!!