Hello everyone,
If I type the name, and I check and Gender Scholar, my button will

appear
What I am looking to:
Check my buttons, and when I start typing the name, the button

Submit appear, st if I delete the text, the Submit button

disappear

Here's the script:


Code:
<head>
  <script type="text/javascript" src="jquery.validate.js"></script>
  <script>
  $(document).ready(function(){
    $("#commentForm").validate();
  });
  function check_required(){
	
	//alert(document.getElementById('rdo_boursier_oui').checked);
	//alert(document.getElementById('txt_lastname').value != "");
	if((document.getElementById('rdo_boursier_oui').checked == true 

|| document.getElementById('rdo_boursier_non').checked == true) &&

(document.getElementById('rdo_sexe_eleve_m').checked == true || 

document.getElementById('rdo_sexe_eleve_f').checked == true)
	
&&	(document.getElementById('txt_lastname').value != "" )

	
	)
 	{
		document.getElementById

('submit_etape2').style.display='block';
	}else{
		document.getElementById

('submit_etape2').style.display='none';
	}
  }
  </script>
  </head>
  
  
  <form action="#" method="post" id="commentForm">
   	<input class="submit" type="submit" name="submit_etape2" 

id="submit_etape2" value="" style="display:none;"/>
  				
			<p class="p_float">
				<label for="lastname">Votre nom<span 

class="required_red">*</span></label>
				<input type="text" name="txt_lastname" 

id="txt_lastname" value="" class="required" minlength="3" 
               
                onchange="check_required();"
                 />
			</p>
			
			
			<p class="p_float rdo">
				<label for="boursier">Boursier<span 

class="required_red">*</span></label>
			
				<input type="radio" name="rdo_boursier" 

id="rdo_boursier_oui" value="" class="rdo_sexe_eleve snd_inscription 

required" onclick="check_required();"/>Oui
				<input type="radio" name="rdo_boursier" 

id="rdo_boursier_non" value="" class="rdo_sexe_eleve snd_inscription 

required" onclick="check_required();"/>Non
			</p>
			
			<p class="p_float rdo">
				<label for="sexe">Sexe<span 

class="required_red">*</span></label>
				<input type="radio" 

name="rdo_sexe_eleve" id="rdo_sexe_eleve_m" class="rdo_sexe_eleve 

snd_inscription required" onclick="check_required();" value="">M
				<input type="radio" 

name="rdo_sexe_eleve" id="rdo_sexe_eleve_f" class="rdo_sexe_eleve 

snd_inscription required" onclick="check_required();" value="">F
			</p>
			
            
  
  </form>