Multiple Windows Using Window.open()

I have 2 jsp pages which are loaded from the same browser window.
Inside these jsp pages, I have created 2 windows to write client side
log. I have used different id for 2 windows as follow.

In JSP1 page I create one window & second window is created in jsp2
page.

Win1 = window.open('Log1', 'win1',
config='right=0,top=60,toolbar=0,width=300,height= 300,resizable=1,scrollbars=1,location=no,status=no
');

Win1.document.writeln(yyyy + '-' + mm + '-' + dd + ' ' + hh + ':' + mn
+ ':' + ss + ',' + ms);

Win2 = window.open('Log2', 'win2',
config='right=0,top=60,toolbar=0,width=300,height= 300,resizable=1,scrollbars=1,location=no,status=no
');

Win2.document.writeln(yyyy + '-' + mm + '-' + dd + ' ' + hh + ':' + mn
+ ':' + ss + ',' + ms);

When the page loads I can see 2 pop-up windows just fine. But then all
the writeln statements(from page1 & page2) go to the win2. Even the
writeln statements from page1. I would like to have page1 log go to
win1 & page2 go to win2. What I am doing wrong?