function addOpt(oCntrl, iPos, sTxt, sVal){
                var selOpcion=new Option(sTxt, sVal);
                eval(oCntrl.options[iPos]=selOpcion);
                }

                function cambia(oCntrl){
                while (oCntrl.length) oCntrl.remove(0);
                switch (document.frm.departamento.selectedIndex){
                case 0:
                addOpt(oCntrl,  0, "Abraham Munguia", "Abraham Munguia");
                addOpt(oCntrl,  1, "Tomas Ruiz", "Tomas Ruiz");
                addOpt(oCntrl,  2, "Edgar Rodriguez", "Edgar Rodriguez");
                addOpt(oCntrl,  3, "Adrian Leon", "Adrian Leon");
                addOpt(oCntrl,  4, "Michelle Robles", "Michelle Robles");
                addOpt(oCntrl,  5, "Alfredo Valdez", "Alfredo Valdez");
                break;
                case 1:
                addOpt(oCntrl,  0, "Juan Zarate", "Juan Zarate");
                addOpt(oCntrl,  1, "Rosario Barreras.", "Rosario Barreras");
                addOpt(oCntrl,  2, "Luis Alberto Haros", "Luis Alberto Haros");
                break;
                case 2:
                addOpt(oCntrl,  0, "Jesus Aviles", "Jesus Aviles");
                addOpt(oCntrl,  1, "Hans Moreno", "Hans Moreno");
                addOpt(oCntrl,  2, "Raymundo Juarez", "Raymundo Juarez");
                addOpt(oCntrl,  3, "Alfredo Ceballos", "Alfredo Ceballos");
                break;
                case 3:
                addOpt(oCntrl,  0, "Arian Zazueta", "Arian Zazueta");
                addOpt(oCntrl,  1, "Jorge Marmolejo", "Jorge Marmolejo");
                addOpt(oCntrl,  2, "Juan Borboa", "Juan Borboa");
                addOpt(oCntrl,  3, "Fernando Garcia", "Fernando Garcia");
                break;
                }
        }