function contact_install() {
	var fld = document.getElementById( 'mail' );
	if( fld ) {
		var btn = document.getElementsByName( 'submit' );
		if( btn ) {
			btn[0].onclick = function() { 
                         if( '' == fld.value ) {return true; }
                          return verif_email( fld ); 
                         };
		}
	}
}