function surfto(form) { 
var myindex=form.select1.selectedIndex 
if (form.select1.options[myindex].value != 0) { 
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document.write ("<form name='form1'><select name='select1' size='1' style='font-size: 8pt' onChange='surfto(this.form)'>");


document.write ("<option value=''>Lens Testing Index</option>");
document.write ("<option value=''></option>");


document.write ("<option value='testing_lenses.html'>Introduction to lens testing and evaluation</option>");
document.write ("<option value='lens_condition.html'>Physical condition check (dust, scratches, bubbles in glass)</option>");
document.write ("<option value='lens_misalignment.html'>Image Symmetry check (looking for misalignment)</option>");
document.write ("<option value='lens_vignetting.html'>Vignetting check (uneven illumination, dark corners)</option>");
document.write ("<option value='focus_testing.html'>Focus accuracy check (for AF lenses)</option>");

document.write ("<option value='lens_sharpness.html'>Resolution, chromatic aberration and distortion check</option>");
document.write ("<option value='lens_test_samples.html'>A few resolution test samples</option>");




document.write ("</select></form>");