function check(){
	
	for(i=0;i<3;i++){
		document.contact.getElementsByTagName('P')[i].className ='';
		}

	if(document.contact.nom.value == ""){
		document.contact.getElementsByTagName('P')[0].className ='warning';
		var erreur = 1;
		}
		
	var atom = "[!#-'*+\\-\\/-9=?A-Z^-~]+";
	var regex_adresse = new RegExp("^"+atom+"(\\."+atom+")*@"+atom+"(\\."+atom+")*\\.[a-zA-Z]{2,4}$");
	if(document.contact.email.value == "" || document.contact.email.length > 100 || document.contact.email.value.search(regex_adresse) != 0){
		document.contact.getElementsByTagName('P')[1].className ='warning';
		var erreur = 1;
		}
	
	if(document.contact.message.value == ""){
		document.contact.getElementsByTagName('P')[2].className ='warning';
		var erreur = 1;
		}
	if(document.contact.securite.value == ""){
		document.contact.getElementsByTagName('P')[3].className ='warning';
		var erreur = 1;
		}	
				
	if(!erreur){
		return true;
		}
	else if(erreur){
		return false;
		}
	}

/*function sclass(x){
		document.getElementsByTagName('P')[x].className ='test';
	if(document.getElementById('span'+x) != 'null'){
		document.getElementById('span'+x).style.display='block';
		}
	}
function sclassout(x){
		document.getElementsByTagName('P')[x].className = '';
	/*if(document.getElementById('span'+x) != 'null'){
		document.getElementById('span'+x).style.display='none';
		}
	}*/