help

Can someone help me with this fct :   =IF(ISBLANK(F55));"";IF(F55='TRM DB'!G1;"'TRM DB'!G6");IF(F55='TRM DB'!H1;"'TRM DB'!H6");IF(F55='TRM DB'!I1;"'TRM DB'!I6");IF(F55='TRM DB'!J1;"'TRM DB'!J6");IF...