<form name="form1">
<input name="input_1">....
</form>
for(i=1;i<= n;i++){
this_input_name="input_"+i;
this_value=document.form1.elements[this_input_name].value;
....
}
<input name="input_1">....
</form>
for(i=1;i<= n;i++){
this_input_name="input_"+i;
this_value=document.form1.elements[this_input_name].value;
....
}
=>
this_value=document.all(this_input_name).value;