The simplest solution is to just send the keys to activate the Fonts menu. Be shure to change the first lines of the script to make it work in your language!
;FontSize.ahk
; Changes the displayed font size in Internet Explorer by pressing Ctrl+ and Ctrl-
;Skrommel @2005
#SingleInstance,Force
SetTitleMatchMode,2
titletext=Internet Explorer ;text to look for in the caption of the active window
counter=3 ;current menu position=Normal
menulines=5 ;number of menu lines
menukeys=!vn ;keys to press to activate the Font menu
^+::
IfWinActive,%titletext%,
{
counter+=1
If counter>%menulines%
counter=%menulines%
Send,%menukeys%{Up %counter%}{Enter}
}
Else
Send,^+
Return
^-::
IfWinActive,%titletext%,
{
counter-=1
If counter<1
counter=1
Send,%menukeys%{Up %counter%}{Enter}
}
Else
Send,^-
Return
To use it, download and install AutoHotkey from
www.autohotkey.com. Save the script as FontSize.ahk and doubleclick to run.
For other scripts and tools, check out my home page at
Skrommel Software.
Skrommel