function box_check(){
	rt_1 = false;
	rt_2 = false;
	rt_3 = false;
	rt_4 = false;
	rt_5 = false;
	rt_6 = false;
	rt_7 = false;
	rt_8 = false;
	rt_9 = false;
	rt_10 = false;
	
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_1[j];
		if(form_element.checked){
			rt_1 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_2[j];
		if(form_element.checked){
			rt_2 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_3[j];
		if(form_element.checked){
			rt_3 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_4[j];
		if(form_element.checked){
			rt_4 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_5[j];
		if(form_element.checked){
			rt_5 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_6[j];
		if(form_element.checked){
			rt_6 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_7[j];
		if(form_element.checked){
			rt_7 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_8[j];
		if(form_element.checked){
			rt_8 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_9[j];
		if(form_element.checked){
			rt_9 = true;
		}
	}
	for(j=0;j<10;j++){
		form_element = document.forms.quiz.q_10[j];
		if(form_element.checked){
			rt_10 = true;
		}
	}
	
	if(rt_1 && rt_2 && rt_3 && rt_4 && rt_5 && rt_6 && rt_7 && rt_8 && rt_9 && rt_10){
		return true;
	}else{
		alert('Merci de répondre à toutes les questions.');
		return false;
	}
}