Hi,
I too had this problem.. I got solution from Microsoft and it's working fine.
Here is the General Solution given by the Microsoft to the blank window problem:
Problem seemed like happening because of syncronization between open() function and other functions. Do the following.
1. Include
var win1;
win1 = window.open('', 'eah', 'top='+((screen.height - 600) / 2)+',left='+((screen.width - 800) / 2)+'+,toolbar=no,status=no,resizable=no,width=800,height=600,scrollbars=yes');
win1.focus();
window.setTimeout('eah',200);
Hope this would help you..