function init(){
	document.forms['FormName'].carte.onchange= function() {
		valueSelected = document.forms['FormName'].carte.options[document.forms['FormName'].carte.selectedIndex].value;
		
		if (valueSelected != 'Pas de carte' ){ 
		  document.getElementById('numero_compte').style.display = 'block';
	    }else{
		  document.getElementById('numero_compte').style.display = 'none';
		}
	}	
}