You can use Javascript to add the control the size of windows that pop-up or open.
example1>>> (opening a new window 
  with a link that is sized) 
  example2>>>  (opening 
  a new window when the page loads)
example3>>> (resizing 
and relocating a window when the page loads)  
How?
  
A. Opening a new window with a link that is sized and in a specific location. Put in the link:
<a href="javascript:;window.open('http://www.google.com',
  'newpage','height=100,width=200,left=0,top=235,
  scrollbars=no,resizable=no')">linkname</a>
B. Method for opening a new window when the page loads. In the BODY tag put:
<body onload="javascript:;window.open('http://www.google.com',
  'newpage','height=100,width=200,left=0,top=235,
  scrollbars=no,resizable=no')"
C. Method to relocate a window inside of that window. Put in the Body tag:
<body onload="javascript:;resizeTo(800,600);moveTo(0,0);"