re=/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}\$/;
	if(re.test(document.forms[0].ipv4.value)==false){
		valid=false;
		message+="Wrong IP address !\n";
	}