function roundit(a){return Math.round(a*100)/100}function cmconvert(){with(document.cminch){feet.value=roundit(cm.value/30.84);inch.value=roundit(cm.value/2.54)}}function inchconvert(){with(document.cminch){cm.value=roundit(inch.value*2.54);feet.value=roundit(inch.value/12)}}function feetconvert(){with(document.cminch){cm.value=roundit(feet.value*30.48);inch.value=roundit(feet.value*12)}};