selval = new Array(12);
selval[0] = "baj.htm";
selval[1] = "gro.htm";
selval[2] = "mex.htm";
selval[3] = "mich.htm";
selval[4] = "mor.htm";
selval[5] = "pue.htm";
selval[6] = "tlx.htm";
selval[7] = "df.htm";
selval[8] = "teo.htm";
selval[9] = "vcrz.htm";
selval[10] = "xxx.htm";
selval[11] = "index.htm";

function gonext(idx)
{   var ix1 = idx;
    if (ix1 < 0) {ix1 = document.selform.select1.selectedIndex;}
    top.location = selval[ix1];
}