help about wmctrl

[wxuyec]

I want to use wmctrl to focus my Adobe reader windows.
first I bind the <S-r> to "wmctrl -a "Adobe Reader"".
but when I have more than one Adobe windows, and
I can only pop up a certain one window, I can't go through
all the Adobe windows by hitting <S-r> again.
so I want to use the shell script. I write like this:
1 #!/bin/sh
2
3 a=$(wmctrl -l | grep "Adobe Reader" | awk '{print $4$5$6}' | wc -l)
4 b=$(wmctrl -l | grep "Adobe Reader" | awk '{print $4$5$6}')
5 #for((i==0;i<$a;i++));do
6 # c[i]=$(awk -F ' ' '{print $i}' $b);
7 # echo $c[i];
8 #done;
9 declare -a c;
10 let i=0;
11 for list in $b;
12 do
13 c[$i]=${list/-/ - };
14 wmctrl -a ${c[i]}
15 let i=i+1;
16 done;
but it can only pop up all the Adobe windows. I can't go through them
one by one. so anybody gets some idea about it?
Thank you in advance.