// validate.js

function validateZIP(field) {
	var valid = "0123456789-";
	var hyphencount = 0;
	
	if (field.length!=5 && field.length!=10) {
		alert("Please enter your 5 digit or 5 digit+4 zip code.");
		return false;
	}
	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
		if (temp == "-") hyphencount++;
		if (valid.indexOf(temp) == "-1") {
			alert("Invalid characters in your zip code. Please try again.");
			return false;
		}
		if ((hyphencount > 1) || ((field.length==10) && ""+field.charAt(5)!="-")) {
			alert("The hyphen character should be used with a properly formatted 5 digit+four zip code, like '12345-6789'. Please try again.");
			return false;
	   }
	}
	return true;
}

function validateEmail (field) {
	var atcount = 0;
	var dotcount = 0;
	var beforedot = 0;
	var afterdot = 0;
	var beforeat = 0;
	var afterdat = 0;
	
	if (field.length==0) {
		alert("Please enter a proper email address.");
		return false;
	}
	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
		if (temp == "@") atcount++;
		else if (temp == ".") dotcount++;
		if (dotcount == 0) beforedot++;
		else afterdot++;
		if (atcount == 0) beforeat++;
		else afterdat++;
	}
	if (atcount!=1) {
		alert("A valid email address must contain one '@'");
		return false;
	}
	if (dotcount<1) {
		alert("A valid email address must contain at least one '.'");
		return false;
	}
	if (beforedot==0 || afterdot<3 || beforeat==0 || afterdot<1) {
		alert("Please enter a proper email address.");
		return false;
	}	
	return true;
}

function validateNumber(field) {
	var valid = "0123456789";   
 	for (var i=0; i < field.length; i++) {
		temp = "" + field.substring(i, i+1);
 		if (valid.indexOf(temp) == "-1") {
			alert("Non-numeric characters in your number. Please try again.");
			return false;
		}
	}
	return true;
}

function radioChoice (field)
{
    var choice = "";
     for (i = 0; i < field.length; i++) {
         if (field[i].checked == true) {
             choice = field[i].value;
             break;
         }
     }
     return choice;
}