I am trying to use the following codes:
<a href="javascript:openwin('<%=RptName%>');"
and
<SCRIPT LANGUAGE="JavaScript">
function openwin(RptName){
  MsgWin = Window.open('Standby.htm',null,"width=100, height=20,top=250,left=350,scrollbars=0,menubar=0, titlebar=0,toolbar=0, status=0, resizable=0");
  Rptwin= window.open(rptName,null,"width=1000, height=550,top=10,left=10,toolbar=1, status=1, resizable=1, location=1");
  MsgWin.close()}
</SCRIPT>
to open a spreadsheet on the browser, however, since sometimes when the spreadsheet is large, the screen shows nothing but blank page while it is loading the large spreadsheet.

So I am trying to open a small window (StandBy.Htm) to display a 'Please Stand by...' message before it opens the real spreadsheet, at which point, I do a window.close to close this StandBy.Htm.

Not sure if this is the right way to do this type of thing, but my second window.open doesn't seem to open the second window. Can someone direct me to the right place?

Thanks.

I have this issue resolved.

Instead of using,

<SCRIPT LANGUAGE="JavaScript">
function openwin(RptName){
  MsgWin = Window.open('Standby.htm',null,"width=100, height=20,top=250,left=350,scrollbars=0,menubar=0, titlebar=0,toolbar=0, status=0, resizable=0");
  Rptwin= window.open(rptName,null,"width=1000, height=550,top=10,left=10,toolbar=1, status=1, resizable=1, location=1");
  MsgWin.close()}
</SCRIPT>

Which opens two separate window objects, I'm using,

<SCRIPT LANGUAGE="JavaScript">
function openwin(RptName){
  Win = Window.open('Standby.htm',null,"width=1000, height=550,top=10,left=10,toolbar=1, status=1, resizable=1, location=1");
  win= window.open(rptName,null,"width=1000, height=550,top=10,left=10,toolbar=1, status=1, resizable=1, location=1");
 </SCRIPT>

I open two windows (but one window object) with same size and let the second one (whenever it is ready to open) to replace the previous window.

If you know any better way, please let me know.