selval = new Array(18);
selval[0] = "tol1.htm";
selval[1] = "tol2.htm";
selval[2] = "ten1.htm";
selval[3] = "ten2.htm";
selval[4] = "clx1.htm";
selval[5] = "clx2.htm";
selval[6] = "mpc1.htm";
selval[7] = "mal1.htm";
selval[8] = "mal2.htm";
selval[9] = "mal3.htm";
selval[10] = "mal4.htm";
selval[11] = "mal5.htm";
selval[12] = "mal6.htm";
selval[13] = "cha1.htm";
selval[14] = "cha2.htm";
selval[15] = "cha3.htm";
selval[16] = "cha4.htm";
selval[17] = "../mex.htm";

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