var numb      = "0123456789";
var phone     = "- ()"+numb;
var price     = ",.-"+numb;
var capitals  = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var undercast = "abcdefghijklmnopqrstuvwxyz";
var alphabet  = capitals+undercast;

function restrictKeys(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;
	}
	t.value = w;
}