<script language="JavaScript"><!-- function cmConverter(){ document.converter.inch.value = document.converter.cm.value / 2.54 document.converter.feet.value = document.converter.cm.value / 30.48 } function inchConverter(){ document.converter.cm.value = document.converter.inch.value * 2.54 document.converter.feet.value = document.converter.inch.value / 12 } function feetConverter(){ document.converter.cm.value = document.converter.feet.value * 30.48 document.converter.inch.value = document.converter.feet.value * 12 } //--></script><form name="converter">Cm: &nbsp <input type="text" name="cm" onChange="cmConverter()"><br />Inch: <input type="text" name="inch" onChange="inchConverter()"><br />Feet: <input type="text" name="feet" onChange="feetConverter()"><br /><input type="button" value="Convert!" /></form>