// PRELOAD IMAGES
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		homelt = newImage("images/homeLT.gif");
		mayorslt = newImage("images/mayorsLT.gif");
		policedeptlt = newImage("images/policeDeptLT.gif");
		citycouncillt = newImage("images/cityCouncilLT.gif");
		linkslt = newImage("images/linksLT.gif");
		firedeptlt = newImage("images/fireDeptLT.gif");
		publicworkslt = newImage("images/publicWorkLT.gif");
		planninglt = newImage("images/planningLT.gif");
		calendarlt = newImage("images/calendarLT.gif");
		contactslt = newImage("images/contactsLT.gif");
		preloadFlag = true;
	}
}

function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

//EMAIL VALIDATION
function checkEmail(myForm) {
  if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(myForm.fromemail.value)){
    //alert("Valid Email Address")
    return (true);
  }
  else
    alert("Invalid E-mail Address! Please re-enter.");
    myForm.fromemail.focus();     //Set focus to email field
    return (false);
}

// NEW WINDOW 
function NewWindow(mypage, myname, w, h, scroll) {
    var w = Number(450) 
    var h = Number(450)
    var winl = (screen.width - w) / 2;
    var wint = (screen.height - h) / 2;
    winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable'
    win = window.open(mypage, myname, winprops)
    if (parseInt(navigator.appVersion) >= 4) { win.window.focus();} 
}


//*********************    FORM VALIDATION    ************************************
// DEFINE ERROR MESSAGE FOR FORM VALIDATION FUNCTION
err = 0;
errc = ['OK'];
errc[1] = 'Please verify the zip code (5 or 9 digits).';
errc[2] = 'Please enter the telephone number, including area code.';
errc[3] = 'Please check the expiration date: four digits, e.g., 0709 is the correct date for July, 2009.';
errc[4] = 'This card is not working; can you check the card number again?';
errc[5] = 'Please do not leave this field blank.';
errc[6] = 'Please fill in the email address.';
errc[7] = 'Please check the expiration date: apparently it is expired.';
errc[8] = 'Please check the expiration date: it is not valid.';
errc[9] = 'Please complete the entry.';
errc[10] = 'Please enter a numerical value (may include an exponent e+N).';
errc[11] = 'Please enter a complete URL.';

function cardno(s) {                    // Credit Card Number
  s = s.replace(/\D+/g, '');
  err = checksum(s) ? 0 : 4;
  return [s];
}

function email(s) {                     // Email Address
  a = s.match(/\S+@([-\w]+\.)+\w+/g);
  err = a != null && a.length ? 0 : 6;
  return a;
}

function expires(s) {                   // Expiration Date
  s = nwts(s);
  var m = new Date()
  var m_year = m.getFullYear()%100, m_month = m.getMonth();
  if (s.length != 4 || isNaN(s))
  err = 3;
  else {
    s_month = s.substring(0,2)-0;
    s_year = s.substring(2, 4)-0;
    if (m_year > 70 && s_year < 30) s_year += 100;
/* "Let your great grandson worry about that." */
    if (s_year < m_year || s_year > m_year + 6) err = 8;
    else if (s_year == m_year && !(s_month > m_month)) err = 7;
    else err = 0;
  }   
  return [s];
}

function number(s) {                    // Any Number, Including Exponent
  s = nwts(s)-0;
  err = isNaN(s) ? 10 : 0;
  return [err ? 0 : s];
}

function tel(s) {                       // Telephone, With Area Code + Opt Prefixes
  var a = s.replace(/\D+/g, '-');
  a = a.match(/(\d+-?)*(\d{3}-?){2}\d{4}/g);
  err = a != null && a.length ? 0 : 2;
  return a;
}

function text(s) {                      // Text String, Used For Required Input Fields
  s = trimwts(s);
  err = s.length ? 0 : 5;
  return [s];
}

function url(s) {                       // URLS
  a = s.match(/\w{2,}:\/{2}([-\w]+\.)+\w+\S*/g);
  err = a != null && a.length ? 0 : 11;
  return a;
}

function words(s) {                     // Multiple Words In A Field
  s = trimwts(s);
  err = /\s/.test(s) ? 0 : 9;
  return [s];
}

function zip(s) {                       // zip code
  var a = nwts(s).match(/\d{5}(-?\d{4}){0,1}/g);
  err = a != null && a.length ? 0 : 1;
  return a;
}

function nwts(s) {                      // no white space
  return s.replace(/\s+/g, '');
}

function trimwts(s) {                   // trim white space
  return s.replace(/^\s+|\s+$/g, '');
}

/* this code is copied from
http://www.codelib.net/home/jkm/checksum.js */
function checksum(s) {                  // thanks to daniel_amor@hp.com for AMEX specs
  var p=0, e=8, t=0, c=[], r=0, l=0, i;
  if (s.length != 16) {
    t = 1;
    e = s.length == 13 && 6 || s.length == 15 && 7;
  }
  for (i=p; i<e; i++)
  r += (c[i] = s.charAt(i*2+t) * 2) > 9
  ? Math.floor(c[i]/10 + c[i]%10)
  : c[i];
  for (i=p; i<e+t; i++) l += s.charAt(i*2+1-t)-0;
  l += r;
  return e && l%10 == 0;
}

function valid(element, check) {
  if (element.type == 'text' || element.type == 'textarea') {
    return check(element.value);
  } 
  else { 
    return check(element);
  }
}

present_element = null, present_error = null;

// MAIN VALICATION FUNCTION
function validate(form, list) {
  for (i=0; i<form.elements.length; i++) {
    var element = form.elements[i];
    var n = element.name, out;
    if (list[n] && list[n].verify) {
      out = valid(element, list[n].verify);
      if (err && (list[n].force || present_element != element || present_error != err)) {
        present_error = err;
        present_element = element;
        alert(list[n].message || errc[err]);
        element.focus();
        return false;
      } else if (!err && list[n].filter)
      element.value = out.join(', ');
    }
  }
  return true;
}
//*********************    FORM VALIDATION    ************************************


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		home_over = newImage("images/home-over.gif");
		products_over = newImage("images/products-over.gif");
		services_over = newImage("images/services-over.gif");
		careers_over = newImage("images/careers-over.gif");
		contact_over = newImage("images/contact-over.gif");
		preloadFlag = true;
	}
}