Send Dynamic data to js function

My application contains few Dynamic forms called FormX (when X is the number of the forum)

Here is my simple function:
function MessageCodeA(NumForm){

if (eleNum==NumForm){
form_NumForm.recepitmain.value +=”<br>”;
}
else if (eleNum==NumForm){
form_NumForm.recepitmain.value +=”<br>”;
}
}

How do I pass the value to the Form when the Form name changes dynamically.

10x

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