Control problem based on two forms

Hello everyone,
I have a problem with the control of my two forms
principle it is good for the first form, but if I wanted to control my 2nd form, blocking ca
Here’s the script:


<html>
<head>
<script type="text/javascript" >
function formValidation1(oEvent) {
oEvent = oEvent || window.event;
var txtField = oEvent.target || oEvent.srcElement;

var txt_nom_pereck1=true;
var msg=" ";
if(document.getElementById("txt_nom_pere").value.length < 3 ){ txt_nom_pereck1=false; msg = msg + "Your name should be minimun 3 char length";}
if(document.getElementById("txt_prenom_pere").value.length < 3 ){ txt_nom_pereck1=false; msg = msg + "Your name should be minimun 3 char length";}


if(txt_nom_pereck1){document.getElementById("submit_etape4").style.display='block'; }
else{document.getElementById("submit_etape4").style.display='none'; }
}

window.onload = function () {


var submit_etape4 = document.getElementById("submit_etape4");

var txt_nom_pere = document.getElementById("txt_nom_pere");
var txt_prenom_pere = document.getElementById("txt_prenom_pere");

var txt_courriel_pere = document.getElementById("txt_courriel_pere");
var txt_courriel_pere_conf = document.getElementById("txt_courriel_pere_conf");



var txt_nom_pereck1=false;
document.getElementById("submit_etape4").style.display='none';
txt_nom_pere.onkeyup = formValidation1;
txt_prenom_pere.onkeyup = formValidation1;

}

//************Partie 2 : ******/////////////////////////////

/*
function formValidation2(oEvent) {
oEvent = oEvent || window.event;
var txtField = oEvent.target || oEvent.srcElement;

var txt_nom_pereck2=true;
var msg=" ";

if(document.getElementById("txt_courriel_pere").value.length < 3 ){ txt_nom_pereck2=false; msg = msg + "Your name should be minimun 3 char length";}
if(document.getElementById("txt_courriel_pere_conf").value.length < 3 ){ txt_nom_pereck2=false; msg = msg + "Your name should be minimun 3 char length";}


if(txt_nom_pereck2){document.getElementById("submit_etape5").style.display='block'; }
else{document.getElementById("submit_etape5").style.display='none'; }
}

window.onload = function () {


var submit_etape5 = document.getElementById("submit_etape5");

var txt_courriel_pere = document.getElementById("txt_courriel_pere");
var txt_courriel_pere_conf = document.getElementById("txt_courriel_pere_conf");



var txt_nom_pereck2=false;
document.getElementById("submit_etape5").style.display='none';
txt_nom_pere.onkeyup = formValidation2;
txt_prenom_pere.onkeyup = formValidation2;
}

Je voulais activer cette partie pour comtrole le Form 2
Le probleme existe au niveau des nom des fonctions

I wanted this part to enable the Comtrol Form 2
The problem exists at the level of function names
*/
</script>

</head>
<body >
<form method=" post" action="form-success.php">
<table>
<tr>
<td>First Name</td>
<td><input type="text" id="txt_nom_pere" name="FirstName"></td>
</tr>
<tr>
<td>First Name</td>
<td><input type="text" id="txt_prenom_pere" name="FirstName"></td>
</tr>
</table>
<input type="button" id="submit_etape4" value="Sign Up!!" style="display:none;"  /> 
</form>




<form method=" post" action="form-success.php">
<table>
<tr>
<td>First Name</td>
<td><input type="text" id="txt_courriel_pere" name="FirstName"></td>
</tr>
<tr>
<td>First Name</td>
<td><input type="text" id="txt_courriel_pere_conf" name="FirstName"></td>
</tr>
</table>
<input type="button" id="submit_etape5" value="Sign Up!!" style="display:none;"  /> 
</form>


</body>
</html>