passing var from differnt domain

how do i pass a variable for file browsing from one domain to another?
when i use the code below i get several errors.

permision denied...
permision denied...
and
object dosnt suport property or method

but when i run the same file browse from where the page is called i dont recieve an error..

please help!

thanks
-paul

<SCRIPT language="javascript">
var sImagesPath = document.location.pathname.substring(0,document.location.pathname.lastIndexOf('/')+1) ;
function getDoc(fileName)
{
window.opener.setImage(fileName);
window.close();
}
</SCRIPT>

<A href="javascript:getDoc('#request.secureurl#/EM/#ThisDirectory#/Images/#Images.name#');window.close();">#Images.name#</A>