Substituir nome de função com Array

Pessoal tenho as funções q são idênticas:

function referencias1(selObj){  if((selObj.options[selObj.selectedIndex].value == "090")||(selObj.options[selObj.selectedIndex].value == "100")){ document.all.ref_1a.style.visibility = "hidden"; document.all.ref_1b.style.visibility = "visible";  }  if(selObj.options[selObj.selectedIndex].value == "080"){ document.all.ref_1a.style.visibility = "visible"; document.all.ref_1b.style.visibility = "hidden";  }  if (selObj.options[selObj.selectedIndex].value == ""){ document.all.ref_1a.style.visibility = "hidden"; document.all.ref_1b.style.visibility = "hidden";  } }function referencias2(selObj){  if((selObj.options[selObj.selectedIndex].value == "090")||(selObj.options[selObj.selectedIndex].value == "100")){ document.all.ref_2a.style.visibility = "hidden"; document.all.ref_2b.style.visibility = "visible";  }  if(selObj.options[selObj.selectedIndex].value == "080"){ document.all.ref_2a.style.visibility = "visible"; document.all.ref_2b.style.visibility = "hidden";  }  if (selObj.options[selObj.selectedIndex].value == ""){ document.all.ref_2a.style.visibility = "hidden"; document.all.ref_2b.style.visibility = "hidden";  } }function referencias3(selObj){  if((selObj.options[selObj.selectedIndex].value == "090")||(selObj.options[selObj.selectedIndex].value == "100")){ document.all.ref_3a.style.visibility = "hidden"; document.all.ref_3b.style.visibility = "visible";  }  if(selObj.options[selObj.selectedIndex].value == "080"){ document.all.ref_3a.style.visibility = "visible"; document.all.ref_3b.style.visibility = "hidden";  }  if (selObj.options[selObj.selectedIndex].value == ""){ document.all.ref_3a.style.visibility = "hidden"; document.all.ref_3b.style.visibility = "hidden";  } }....function referencias15(selObj){  if((selObj.options[selObj.selectedIndex].value == "090")||(selObj.options[selObj.selectedIndex].value == "100")){ document.all.ref_15a.style.visibility = "hidden"; document.all.ref_15b.style.visibility = "visible";  }  if(selObj.options[selObj.selectedIndex].value == "080"){ document.all.ref_15a.style.visibility = "visible"; document.all.ref_15b.style.visibility = "hidden";  }  if (selObj.options[selObj.selectedIndex].value == ""){ document.all.ref_15a.style.visibility = "hidden"; document.all.ref_15b.style.visibility = "hidden";  } }

Eu preciso criar uma array para substituir os nomes das funçoes e os números das referencias.

Eu fiz uma assim:

var refs = new Array('1','2','3','4','5','6','7','8','9','10','11','12','13','14','15')for(r=0;r<refs.lenght;r++){function referencia+refsr{  if((selObj.options[selObj.selectedIndex].value == "090")||(selObj.options[selObj.selectedIndex].value == "100")){ document.all.ref_+refs[r]+a.style.visibility = "hidden"; document.all.ref_+refs[r]+b.style.visibility = "visible";  }  if(selObj.options[selObj.selectedIndex].value == "080"){ document.all.ref_+refs[r]+a.style.visibility = "visible"; document.all.ref_+refs[r]+b.style.visibility = "hidden";  }  if (selObj.options[selObj.selectedIndex].value == ""){ document.all.ref_+refs[r]+a.style.visibility = "hidden"; document.all.ref_+refs[r]+b.style.visibility = "hidden";  } }}

mas não tá funcionando. O q está errado?

Alguém poderia me ajudar?

Obrigado.