function convertFtoC(){
	var ov = document.getElementById("from_f").value - 0;
	var rt = Math.round(((ov - 32) / 1.8) * 10) / 10;
	document.getElementById("to_c").innerHTML = rt;
	return false;
}

function convertCtoF(){
	var ov = document.getElementById("from_c").value - 0;
	var rt = Math.round(((ov * 1.8) + 32) * 10) / 10;
	document.getElementById("to_f").innerHTML = rt;
	return false;
}