Non so se già hai provato a mettere
message[i_mes]="abc abc abc"
e per le frecce
slideshowcontent+="<a href=\"#\" style=\"font-family:Arial;font-size:8pt\"> </a><a href=\"java-script:gobackward()\" style=\"font-family:Arial;font-size:8pt\">\<\<</a>\&nbsp\;\&nbsp\;\&nbsp\;"
......
slideshowcontent+="<a href=\"java-script:goforward()\" style=\"font-family:Arial;font-size:8pt\">\>\></a> "

Prova così :master: