<input type="text" id="T1" value="0" onkeyup="chg()" onchange="chg()">+
<input type="text" id="T2" value="0" onkeyup="chg()" onchange="chg()">=
<input type="text" id="T3" value="0">
<script language="javascript">
function chg()
{
document.all.T3.value = parseInt(document.all.T1.value) + parseInt(document.all.T2.value);
}
</script>
<input type="text" id="T2" value="0" onkeyup="chg()" onchange="chg()">=
<input type="text" id="T3" value="0">
<script language="javascript">
function chg()
{
document.all.T3.value = parseInt(document.all.T1.value) + parseInt(document.all.T2.value);
}
</script>
<input type=text name="in1">
<input type=text name="in2">
<input type=text name="in3">
<script>
function test() {
timer=setInterval('add()',500);
}
function add() {
var vin1=document.all.in1.value;
var vin2=document.all.in2.value;
var vin3=parseFloat(vin1)+parseFloat(vin2) ;
document.all.in3.value=vin3;
}
</script>
<input type="text" id="T1" value="0" onkeyup="chg()">+
<input type="text" id="T2" value="0" onkeyup="chg()">=
<input type="text" id="T3" value="0">-
<input type="text" id="T4" value="0" onkeyup="chg()">=
<input type="text" id="T5" value="0">
<script language="javascript">
function chg()
{
document.all.T3.value = parseInt(document.all.T1.value) + parseInt(document.all.T2.value);
document.all.T5.value = parseInt(document.all.T3.value) - parseInt(document.all.T4.value);
}
</script>
<input type="text" name="T" id="T2" value="0" onkeyup="chg()">=
<input type="text" name="T" id="T3" value="0">-
<input type="text" name="T" id="T4" value="0" onkeyup="chg()">=
<input type="text" name="T" id="T5" value="0">
<script language="javascript">
function chg()
{
document.all.T[2].value = parseFloat(document.all.T[0].value) + parseFloat(document.all.T[1].value);
document.all.T[4].value = parseFloat(document.all.T[2].value) - parseFloat(document.all.T[3].value);
}
</script>