Problem with window.close

Hi,

I am having this problem…
I am having two functions.

var pdfWin;

function fOpenPDF()
{
pdfWin = window.open(‘documents/tlilnk-manual.pdf’,‘pdfWin’,‘fullscreen=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,scroll=no,height=600,width=800,left=0,top=0’);
}

function fPDFClose()
{
pdfWin.close();
}

I am calling fOpenPDF on a button click and fPDFClose on unload but this is not working…
could anybody tell me why???
help needed very very urgently…