Change script function

Hi everyone

I use this script:

app.selection[0].contents=”[undefine]”;

app.selection[0].underline=true;

to change whatever I selected

change to [undefine], then make it underline.

but:

if I add the
[undefine] into inserpoint,

the comeout will not underline.

Can someone help me to change the functions:

not matter the
selection or inserpoint I want to get the [undefine] with underline.

thanks

Regard

Teetan