[dev] Help pls with Horde mail program

[V.Gravenberch]

Hello,
 
I have a question.
 
I'm using the Horde mail program trough my provider and have this open in a
Iframe on my website but, when I'm login all seems to look nice in the
Iframe and after login in it will open in an extern browser.  The strange
ting is, is that using your back button it will open the mailbox in the
Iframe.
 
Q1  Why doesn't open and close straigt a way in the Iframe and how can I
change that to make Horde open and closed also after login in the Iframe?
 
Check this link: http://www.dutchmarshalls.com/index.php/mail
 
If someone can help me with this, 
 
Vincent
 
v.gravenberch at dutchmarshalls.com