<!-- http://speedpigeon.com -->
<!-- Original:  Gary Nicholson (nicholsongary@hotmail.com) -->
<!-- Web Site:  http://homepages.ihug.co.nz/~gazzanic/ -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function calculatetime(form) {
//  get conversion factors from selected options
var i = form.distunits.selectedIndex;
var distunitsvalue = form.distunits.options[i].value; 
var j = form.speedunits.selectedIndex;
var speedunitsvalue = form.speedunits.options[j].value;
//  calculate time in seconds    
form.secondvalue.value = (form.distvalue.value * distunitsvalue) / (form.speedvalue.value * speedunitsvalue);
//  convert to hours, minutes, seconds    
form.hourvalue.value = parseInt(form.secondvalue.value / 3600);
form.secondvalue.value = form.secondvalue.value - (form.hourvalue.value * 3600);
form.minutevalue.value = parseInt(form.secondvalue.value / 60);
form.secondvalue.value = parseInt(form.secondvalue.value - (form.minutevalue.value * 60));
return true;
}
function calculatedistance(form) {
//  get conversion factors from selected options
var i = form.distunits.selectedIndex;
var distunitsvalue = form.distunits.options[i].value; 
var j = form.speedunits.selectedIndex;
var speedunitsvalue = form.speedunits.options[j].value;
//  convert time to seconds
var temp = ((parseFloat(form.hourvalue.value) * 3600) + (parseFloat(form.minutevalue.value) * 60) + parseFloat(form.secondvalue.value));
//  calculated distance
form.distvalue.value = ((form.speedvalue.value * speedunitsvalue) * temp) / distunitsvalue; 
return true;
}
function calculatespeed(form) {
//  get conversion factors from selected options
var i = form.distunits.selectedIndex;
var distunitsvalue = form.distunits.options[i].value; 
var j = form.speedunits.selectedIndex;
var speedunitsvalue = form.speedunits.options[j].value;
//  convert time to seconds
var temp = ((parseFloat(form.hourvalue.value) * 3600) + (parseFloat(form.minutevalue.value) * 60) + parseFloat(form.secondvalue.value));
//  calculate speed
form.speedvalue.value = ((form.distvalue.value * distunitsvalue)  / (temp * speedunitsvalue)); 
return true;
}
function clearcell(cell) {
cell.value = "";
return true;
}
//  End -->