function IsNumTelefono(string){
	/* cifre separate da '-' '/' o spazi */
	var reg = /^(\d+\s*(\/\s*\d+){0,1})|(\d+\s*(-\s*\d+)*)$/; 
	//var reg = new RegExp("(\\d+\\s*/\\s*\\d+)|(\\d+\\s*(-\\s*\\d+)*)|((\\d+\\s*)+)");
	return reg.test(string);
}