selval = new Array(15);
selval[0] = "txc1.htm";
selval[1] = "txc2.htm";
selval[2] = "txc3.htm";
selval[3] = "txc4.htm";
selval[4] = "txc5.htm";
selval[5] = "txc6.htm";
selval[6] = "txc7.htm";
selval[7] = "txc8.htm";
selval[8] = "ixc1.htm";
selval[9] = "ixc2.htm";
selval[10] = "txv1.htm";
selval[11] = "rsp1.htm";
selval[12] = "grt1.htm";
selval[13] = "grt2.htm";
selval[14] = "../gro.htm";

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