var alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
var numb = "0123456789";
var phone = numb+"()- ";
var email = alpha+numb+"@._-";
var web = email+"//:&?=";

function res(t,v){
	var w = "";
	for (i=0; i < t.value.length; i++) {
		x = t.value.charAt(i);
		if (v.indexOf(x,0) != -1)
			w += x;
	}
	if (w !== t.value) t.value = w;
}