[Typo3] Add param to one page from dynamic menu

[Markus Oeste]

Hallo!

I want to add a parameter to only one a-tag of the dynamic menu.

I build the menu in my rootnode template with:
temp.left_menu_child=HMENU
temp.left_menu_child {
   special = directory
   special.field = uid
   entryLevel = 1
   1 = TMENU
   1.NO.allWrap = <div id="left_menu_font"> | </div>
}

My Sitestructure is like:
-Root
| -a1
|   -c1
|   -d1  <- i want to add a parameter only on this a-tag
|   -e1
|   -...
| +b1
...

So i can see c1, d1, e1,... in my left menu:
<div id="left_menu_font"> <a href="c1.html" onfocus="blurLink(this);"> 
c1 </a> </div>
<div id="left_menu_font"> <a href="d1.html" onfocus="blurLink(this);"> 
d1 </a> </div>
<div id="left_menu_font"> <a href="e1.html" onfocus="blurLink(this);"> 
e1 </a> </div>

Now i want to add a paramter only in the a-tag of d1:
onClick="window.open('link', 'Name', 'width=750, height=550, 
resizable=no, scrollbars=no, toolbar=no, location=no, directories=no, 
status=no, menubar=no'); return false "

I think i have to add something in the TSconfig field in the page header 
of page d1.

Is this the right position to add this parameter to the a-tag of d1? And 
  if, what to add there?

Regards

Markus Oeste