function switchImage(imgName, imgSrc) 
{
  if (document.images)
  {
    if (imgSrc != "none")
    {
      document.images[imgName].src = imgSrc;
    }
  }
}

function ChangeBgColor(obj, hoverColor) {
	obj.style.backgroundColor=hoverColor
}

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);
// -->


function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

function OnChangeFilter(){
}

function showHideLayers() { //v3.0
  var i,p,v,obj,args=showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

//sweepstakes functions

function isAlphabetic(str)
{
  var len= str.length;
  if (len==0)
    return false;
  //else
  var p=0;
  var ok= true;
  var ch= "";
  while (ok && p<len)
  {
    ch= str.charAt(p);
    if (  ('A'<=ch && ch<='Z')
        ||('a'<=ch && ch<='z')
        ||(ch==" ")
          )
      p++;
    else
      ok= false;
  }
  return ok;
}

function isNumeric(str)
// returns true if str is numeric
// that is it contains only the digits 0-9
// returns false otherwise
// returns false if empty
{
  var len= str.length;
  if (len==0)
    return false;
  //else
  var p=0;
  var ok= true;
  var ch= "";
  while (ok && p<len)
  {
    ch= str.charAt(p);
    if ('0'<=ch && ch<='9')
      p++;
    else
      ok= false;
  }
  return ok;
}

function changePage(ref) {
 if (ref.options[ref.selectedIndex].value == 'NY') {
     location.href = ref.options[ref.selectedIndex].value + ".html"
  }
} 

function checkemail (entry) {
  var indx ;
  if (entry.length <= 0) return -1 ;
  indx = entry.indexOf("@");
  if(indx == -1) return -1 ;
  indx = entry.indexOf(".",indx);
  if(indx == -1) return -1 ;
  if(indx == entry.length-1) return -1 ;
  return 0;
}

function radiogroupvalid(radgroup) {
	var radiogroupvalid = false;
	for (var loopcounter=0; loopcounter < radgroup.length; loopcounter++) {
		if (radgroup[loopcounter].checked)  {
			 radiogroupvalid = true; }
	}
	return radiogroupvalid;
}			

function validate(form) {
var lname=form.lastname.value;
var fname=form.firstname.value;
var dobmonth=form.birthmonth.value;
var dobday=form.birthday.value;
var dobyear=form.birthyear.value;
var address1=form.address1.value;
var city=form.city.value;
var state=form.state.value;
var zip=form.zipcode.value;
var zip4=form.zipcodeplus4.value;
var em=form.email.value;
var pharea=form.dayphonearea.value;
var phday3=form.dayphone3.value;
var phday4=form.dayphone4.value;
var phdayext=form.dayphoneext.value;
var updates=form.updates;
var flag=true

if (radiogroupvalid(updates) == false) {
  alert('Please answer whether you want to receive sponsor updates.');
  form.company.focus();  
  return false;
}

if (isAlphabetic(lname) == false) {
  alert('Your last name is a required field that can only contain characters. Please try again.');
  form.lastname.focus();
  form.lastname.select();
  return false;
  
}

if (isAlphabetic(fname) == false) {
  alert('Your first name is a required field that can only contain characters. Please try again.');
  form.firstname.focus();
  form.firstname.select();
  return false
}

if (form.birthmonth.options[0].selected) {
  alert('Please choose your Month of Birth.');
  return false;
}

if (form.birthday.options[0].selected) {
  alert('Please choose your Day fo Birth.');
  return false;
}

if (isNumeric(dobyear) == false) {
  alert('please enter the year of Birth');
  form.birthyear.focus();
  form.birthyear.select();
  return false
}
if (dobmonth !="" && dobday !="" && dobyear !="") {
var mm = form.birthmonth.value;
var dd = form.birthday.value;
var yy = 19 + form.birthyear.value;
var year = new Date();
var year2 = year.getYear();
var year3 = (year < 2000) ? year2 + 1900 : year2;
thedate = new Date();
mm2 = thedate.getMonth() + 1;
dd2 = thedate.getDate();
yy2 = thedate.getYear();
if (yy2 < 1000) yy2 += 1900;
year1 = mm & dd & yy;
var years = yy2 - yy;
  	if (years < 18 && state != "AK" && state !="HI") {
	    alert("You must be at least 18 years old  to participate in sweepstakes");
	       return false
	   } 
}

if (address1=='') {
  alert('address1 is a required field. Please try again.');
  form.address1.focus();
  form.address1.select();
  return false;
}


if (isAlphabetic(city) == false) {
  alert('city is a required field that can only contain characters. Please try again.');
  form.city.focus();
  form.city.select();
  return false;
}


if (form.state.options[0].selected) {
  alert('Please choose the State you live in.');
  event.returnValue=false;
  return false;
}

if (isNumeric(zip) == false || zip.length != 5) {
  alert('Zip code is a required field. Please enter a valid 5 digit zip code. Please try again.');
  form.zipcode.focus();
  form.zipcode.select();
  return false;
}


if (zip4 !== "" && (isNumeric(zip4) == false || zip4.length !=4)) {
    alert("Invalid Zip+4. Only Numbers are accepted for Zip Code!");
    form.zipcodeplus4.focus();
    form.zipcodeplus4.select();
   return false;
}

if (checkemail(form.email.value) < 0) {
  alert('Please Enter Valid Email ID');  
  form.email.focus();
  form.email.select()
  return false; 
}

if (isNumeric(pharea) == false || pharea.length != 3)
  {
  alert('Day phone number is a required field. Please enter a valid area code and valid phone number. Please try again.');
  form.dayphonearea.focus();
  form.dayphonearea.select();
  return false;
}

if (isNumeric(phday3) == false || phday3.length != 3)
  {
  alert('Day phone number is a required field. Please enter a valid phone number. Please try again.');
  form.dayphone3.focus();
  form.dayphone3.select();
  return false;
}
if (isNumeric(phday4) == false || phday4.length != 4)
  {
  alert('Day phone number is a required field. Please enter a  valid phone number. Please try again.');
  form.dayphone4.focus();
  form.dayphone4.select();
  return false;
}
if (phdayext != "" && (isNumeric(phdayext) == false))
  {
  alert('Please enter a valid Extension. Please try again.');
  form.dayphoneext.focus();
  form.dayphoneext.select();
  return false;
}

return true; 
}

function submitForm(form) {

  form.action = "thanks.asp";
  form.method = "post";
  form.submit();
}



//////////////////////////////////////////////////

<!-- Begin Popup Window
var win = null;
function newWindow(mypage,myname,w,h,features) {
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  if (winl < 0) winl = 0;
  if (wint < 0) wint = 0;
  var settings = 'height=' + h + ',';
  settings += 'width=' + w + ',';
  settings += 'top=' + wint + ',';
  settings += 'left=' + winl + ',';
  settings += features;
  win = window.open(mypage,myname,settings);
  win.window.focus();
}
//  End -->