Ouvrir une page dans un cadre donné...

Bonjour,

Pour un site Internet à 4 cadres : haut, gauche, bas et centre.

Le menu est dans le cadre du bas et je ne parviens pas à ouvrir les pages dans le cadre central.

La commande à été générée avec le logiciel : Sothink DHTML, dont voici le code :

<script type="text/javascript">
<!--
stm_bm(["menu6b59",800,"","blank.gif",0,"","",0,0,200,0,1000,1,0,0,"","",0,0,1,2,"default","hand",""],this);
stm_bp("p0",[0,4,0,0,0,0,18,0,100,"",-2,"",-2,50,0,0,"#799BD8","transparent","tclback.gif",3,0,0,"#000000"]);
stm_ai("p0i0",[0,"Autres Rubriques","","",-1,-1,0,"fdl_fr/centre.html","_self","","","","tclarrow.gif",18,7,0,"","",0,0,0,2,1,"#FFFFF7",1,"#B5BED6",1,"","tclbackup.gif",3,3,0,0,"#FFFFF7","#000000","#FFFF00","#FFFF00","bold 14pt Graphite Std","bold 14pt Graphite Std",0,0],40,17);
stm_bpx("p1","p0",[0,1,0,0,0,0,18,0,100,"",-2,"",-2,50,0,0,"#799BD8","#EEEEEE","tclbackmove.gif"]);
stm_aix("p1i0","p0i0",[0,"","","",-1,-1,0,"","_self","","","","tclarrowblack.gif",18,7,0,"","",0,0,0,0,1,"#FFFFF7",1,"#B5BED6",1,"","",3,3,0,0,"#FFFFF7","#000000","#336699","#000000","12pt Arial","12pt Arial"],112,30);
stm_aix("p1i1","p1i0",[0,"Lettres","","",-1,-1,0,"rubriques/lettres/page.html"],112,30);
stm_aix("p1i2","p1i0",[0,"Contact","","",-1,-1,0,"rubriques/contact/page.html"],112,30);
stm_aix("p1i3","p1i2",[0,"Galerie Photos"],160,30);
stm_aix("p1i4","p1i0",[0,"Archives","","",-1,-1,0,"rubriques/archives/page.html"],112,30);
stm_aix("p1i5","p1i0",[0,"------------","","",-1,-1,0,"centre.html"],148,30);
stm_aix("p1i6","p1i5",[],148,30);
stm_aix("p1i7","p1i5",[],100,30);
stm_ep();
stm_ep();
stm_em();
//-->
</script>

J'ai essayé plusieurs possibilités, "mainframe", "frame"... sans succès !

Merci de m'aider.
Cordialement.