function temp()
{
var item = document.forms[0].period.value.toLowerCase();
var group = document.forms[0].choice;

if (item ==""|| item <=0)
{
alert("You must input a positive number, please try again");
document.form1.period.focus();
return;
}

if (isNaN(item))
{
alert("Input numbers only. Click 'Reset' and try again");
document.form1.period.focus();
return;
}

if (group[0].checked)
{
if (item > 70)
{
alert("You're Kidding, Yes!");
document.form1.period.focus();
return;
}
var degFar;
degFar = (Math.round(((item * 9) /5) + 32))
alert(item + " Degrees Celsius is " + degFar + " Degrees Fahrenheit");
}

if (group[1].checked)
{
if (item > 150)
{
alert("You're Kidding, Yes!");
document.form1.period.focus();
return;
}
var Kilo_metre;
Kilo_metre = (Math.round(item * .6214))
alert(item + " Kilometres is " + Kilo_metre + " Miles ");
}

if (group[2].checked)
{
if (item > 150)
{
alert("You're Kidding, Yes!");
document.form1.period.focus();
return;
}
var miles;
miles = (Math.round(item * 1.609))
alert(item + " Miles is " + miles + " Kilometres");
}



if (group[3].checked)
{
var fe_et;
fe_et = (Math.round(item * .3048))
alert(item + " Feet is " + fe_et + " in Metres");
}

if (group[4].checked)
{
var feet;
feet = (Math.floor(item * 3.2808))
alert(item + " Metres is " + feet + " in Feet");
}

if (group[5].checked)
{
var yards;
 yards = (Math.floor(item * .9144))
alert(item + " Yards is " + yards + " in Metres");
}

if (group[6].checked)
{
var metres;
 metres = (Math.floor(item * 1.094))
alert(item + " Metres is " + metres + " in Yards");
}

if (group[7].checked)
{
var Xinch = item;
var div = Math.pow(10,2);
item = (item * .03937);
var item = (Math.round(item * div) / div);
alert(Xinch + " Millimetres is " + item + " Inches");
}
}