<input type="text" name="T19" id=T19 onblur="mz()"><br>
<input type="text" name="T20" id=T20 onblur="mz()"><br>
<input type="text" name="T21" id=T21 onblur="mz()"><br>
<input type="text" name="textfield" id=T22><br>
<script>
function mz(){
try{
var t19v=document.all.T19.value;
var n1 = (t19v=="")?0:parseFloat(t19v);
var t20v=document.all.T20.value;
var n2 = (t20v=="")?0:parseFloat(t20v);
var t21v=document.all.T21.value;
var n3 =(t21v=="")?0: parseFloat(t21v);
document.all.T22.value = n1 + n2+ n3;
}catch(e){
document.all.T22.value = "";
}
}
</script>
<input type="text" name="T20" id=T20 onblur="mz()"><br>
<input type="text" name="T21" id=T21 onblur="mz()"><br>
<input type="text" name="textfield" id=T22><br>
<script>
function mz(){
try{
var t19v=document.all.T19.value;
var n1 = (t19v=="")?0:parseFloat(t19v);
var t20v=document.all.T20.value;
var n2 = (t20v=="")?0:parseFloat(t20v);
var t21v=document.all.T21.value;
var n3 =(t21v=="")?0: parseFloat(t21v);
document.all.T22.value = n1 + n2+ n3;
}catch(e){
document.all.T22.value = "";
}
}
</script>
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