function validate_one() {
var ChassisValue
var ChassisChecked
var PowerSupplyValue
var PowerSupplyChecked
ChassisValue = document.dyo1.Chassis.value
for (var i=0; i<document.dyo1.Chassis.length; i++)  { 
if (document.dyo1.Chassis[i].checked)  {
ChassisChecked = document.dyo1.Chassis[i].value
} 
}
PowerSupplyValue = document.dyo1.power.value
for (var i=0; i<document.dyo1.power.length; i++)  { 
if (document.dyo1.power[i].checked)  {
PowerSupplyChecked = document.dyo1.power[i].value
} 
}
if ((ChassisChecked == null) && (ChassisValue == null)) {
alert("Please Select a Chassis");
return false;
}
else if ((PowerSupplyChecked == null) && (PowerSupplyValue == null)) {
alert("Please Select a Power Supply");
return false;
}
else
{
return true;
}
}