function buildPhone() {
	// must define all p1/2/3/4 values in main file.
	var phone;
	phone = "(" + window.p1.value + ") ";
	phone += window.p2.value + "-";
	phone += window.p3.value;
	if (window.p4 && window.p4.value != "") {
		phone += " Ext. " + window.p4.value;
	}
	tForm.phone.value = phone;
}
function testLength(c,len,n) {
	if (c.value.length == len) {
		n.focus();
	}
}