function checkFields()
{
missinginfo = "";
email_tem = "";
var err = 0

	string = document.form.form_nasc.value
	var valid = "0123456789/"
	var ok = "yes";
	var temp;
	for (var i=0; i< string.length; i++) 
	{
		temp = "" + string.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") err = 1;
	}
	if (string.length != 10) err=1
	d = string.substring(0, 2) // dia
	c = string.substring(2, 3)// '/'
	b = string.substring(3, 5) // mes
	e = string.substring(5, 6)// '/'
	f = string.substring(6, 10) // ano
	if (b<1 || b>12) err = 1
	if (c != '/') err = 1
	if (d<1 || d>31) err = 1
	if (e != '/') err = 1
	if (f<1900 || f>1999) err = 1
	if (b==4 || b==6 || b==9 || b==11){
	if (d==31) err=1
	}
	if (b==2){
	var g=parseInt(f/4)
	if (isNaN(g)) {
	err=1
	}
	if (d>29) err=1
	if (d==29 && ((f/4)!=parseInt(f/4))) err=1
	}
	if (err==1)
	{
	missinginfo += "\n     - Data de nascimento";
	}

if(document.form.form_nome.value == "")
	{
	missinginfo += "\n     - Nome";
	}

if((!document.form.form_sexo[0].checked) && (!document.form.form_sexo[1].checked))
	{
	missinginfo += "\n     - Sexo";
	}
if((document.form.form_email.value.indexOf('@') == -1) ||(document.form.form_email.value.indexOf('.') == -1) ||(document.form.form_email.value.length < 8))
	{
	email_tem = 1;
	}
if((email_tem == 1)||(document.form.form_email.value == ""))
	{
	missinginfo += "\n     - E-mail";
	}
if
(document.form.form_msg.value == "")
{
missinginfo += "\n     - Comentario";
}
if
(missinginfo != "")
{
missinginfo ="Por favor, preencha corretamente o(s) campo(s):\n" + missinginfo + "\n\ne envie o formulario novamente.";
alert(missinginfo);
return false;
}
}

<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
function MM_jumpMenuGo(objId,targ,restore){ //v9.0
  var selObj = null;  with (document) { 
  if (getElementById) selObj = getElementById(objId);
  if (selObj) eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0; }
}
//-->

/***********************************************
* Universal Countdown script- © Dynamic Drive (http://www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

function cdLocalTime(container, servermode, offsetMinutes, targetdate, debugmode){
if (!document.getElementById || !document.getElementById(container)) return
this.container=document.getElementById(container)
var servertimestring=(servermode=="server-php")? '<? print date("F d, Y H:i:s", time())?>' : (servermode=="server-ssi")? '<!--#config timefmt="%B %d, %Y %H:%M:%S"--><!--#echo var="DATE_LOCAL" -->' : '<%= Now() %>'
this.localtime=this.serverdate=new Date(servertimestring)
this.targetdate=new Date(targetdate)
this.debugmode=(typeof debugmode!="undefined")? 1 : 0
this.timesup=false
this.localtime.setTime(this.serverdate.getTime()+offsetMinutes*60*1000) //add user offset to server time
this.updateTime()
}

cdLocalTime.prototype.updateTime=function(){
var thisobj=this
this.localtime.setSeconds(this.localtime.getSeconds()+1)
setTimeout(function(){thisobj.updateTime()}, 1000) //update time every second
}

cdLocalTime.prototype.displaycountdown=function(baseunit, functionref){
this.baseunit=baseunit
this.formatresults=functionref
this.showresults()
}

cdLocalTime.prototype.showresults=function(){
var thisobj=this
var debugstring=(this.debugmode)? "<p style=\"background-color: #FCD6D6; color: black; padding: 5px\"><big>Debug Mode on!</big><br /><b>Current Local time:</b> "+this.localtime.toLocaleString()+"<br />Verify this is the correct current local time, in other words, time zone of count down date.<br /><br /><b>Target Time:</b> "+this.targetdate.toLocaleString()+"<br />Verify this is the date/time you wish to count down to (should be a future date).</p>" : ""

var timediff=(this.targetdate-this.localtime)/1000 //difference btw target date and current date, in seconds
if (timediff<0){ //if time is up
this.timesup=true
this.container.innerHTML=debugstring+this.formatresults()
return
}
var oneMinute=60 //minute unit in seconds
var oneHour=60*60 //hour unit in seconds
var oneDay=60*60*24 //day unit in seconds
var dayfield=Math.floor(timediff/oneDay)
var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour)
var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute)
var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute))
if (this.baseunit=="hours"){ //if base unit is hours, set "hourfield" to be topmost level
hourfield=dayfield*24+hourfield
dayfield="n/a"
}
else if (this.baseunit=="minutes"){ //if base unit is minutes, set "minutefield" to be topmost level
minutefield=dayfield*24*60+hourfield*60+minutefield
dayfield=hourfield="n/a"
}
else if (this.baseunit=="seconds"){ //if base unit is seconds, set "secondfield" to be topmost level
var secondfield=timediff
dayfield=hourfield=minutefield="n/a"
}
this.container.innerHTML=debugstring+this.formatresults(dayfield, hourfield, minutefield, secondfield)
setTimeout(function(){thisobj.showresults()}, 1000) //update results every second
}

/////CUSTOM FORMAT OUTPUT FUNCTIONS BELOW//////////////////////////////

//Create your own custom format function to pass into cdLocalTime.displaycountdown()
//Use arguments[0] to access "Days" left
//Use arguments[1] to access "Hours" left
//Use arguments[2] to access "Minutes" left
//Use arguments[3] to access "Seconds" left

//The values of these arguments may change depending on the "baseunit" parameter of cdLocalTime.displaycountdown()
//For example, if "baseunit" is set to "hours", arguments[0] becomes meaningless and contains "n/a"
//For example, if "baseunit" is set to "minutes", arguments[0] and arguments[1] become meaningless etc

//1) Display countdown using plain text
function formatresults(){
if (this.timesup==false){//if target date/time not yet met
var displaystring="<span style='background-color: #CFEAFE'>"+arguments[1]+" hours "+arguments[2]+" minutes "+arguments[3]+" seconds</span> para a XVa Convencao de Plastimodelismo da ASP!"
}
else{ //else if target date/time met
var displaystring="Launch time!"
}
return displaystring
}

//2) Display countdown with a stylish LCD look, and display an alert on target date/time
function formatresults2(){
if (this.timesup==false){ //if target date/time not yet met
var displaystring="<span class='lcdstyle'>"+arguments[0]+" <sup>days</sup> "+arguments[1]+" <sup>hours</sup> "+arguments[2]+" <sup>minutes</sup> "+arguments[3]+" <sup>seconds</sup></span> para a XVa Convencao de Plastimodelismo da ASP!"
}
else{ //else if target date/time met
var displaystring="" //Don't display any text
alert("Launch time!") //Instead, perform a custom alert
}
return displaystring
}