Fahrenheit to Celsius Converter

This 'script' uses some simple javascript:

<input type=text name=F size=6 value=32
onChange="C.value = 100/(212-32) * (this.value - 32 )">
<input type=text name=C size=6 value=0
onChange="F.value = (212-32)/100 * this.value + 32 ">