I'm not sure what you guys are talking about, but from what I gather....
You have a form on a page and maybe a form later on in the page each with similar values. After the user fills in the first form, you want to fill in the other form for them.....
Is that correct?
If so, then you can use javascript!
<form name=myForm1>
<input type=text name=firstName1 value=<?echo $firstName1?>>
<input type=text name=lastName1 value=<?echo $lastName1?> onChange="javascript:document.this.myForm2.firstName2.value=document.this.myForm1.firstName1.value; document.this.myForm2.lastName2.value=document.this.myForm1.lastName1.value;">
</form>
<form name=myForm2>
<input type=text name=firstName2 value=<?echo $firstName2?>>
<input type=text name=lastName2 value=<?echo $lastName2?>
</form>
Forget it if that's not what you want.
you may have to take out the .this. I don't remember.