var w = 800, h = 600;
if (document.all || document.layers) {
   w = screen.availWidth; h = screen.availHeight;}
var popW = 520, popH = 300;
var leftPos = (w-popW)/2, topPos = (h-popH)/2;

function valida(){
allowance=true; msg=''; erromail = 0; var oForm=document.form2;

if (oForm.email.value.length > 0)
{
var FormatoEmail=/^(.+)@(.+)$/;
var CharsEspeciais="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
var CharsValidos="\[^\\s" + CharsEspeciais + "\]";
var sUser="(\"[^\"]*\")";
var atom=CharsValidos + '+';
var sPalavra="(" + atom + "|" + sUser + ")";
var oUser=new RegExp("^" + sPalavra + "(\\." + sPalavra + ")*$");
var FormatoDominio=new RegExp("^" + atom + "(\\." + atom +")*$");
var oArrayOcorrencias=oForm.email.value.match(FormatoEmail);
if (oArrayOcorrencias==null) {erromail = 1}
else{
var user=oArrayOcorrencias[1];
var dominio=oArrayOcorrencias[2];
if (user.length && dominio.length){
for (i=0; i<user.length; i++) {if (user.charCodeAt(i)<32 || user.charCodeAt(i)>169 || (user.charCodeAt(i)>32 && user.charCodeAt(i)<45) || (user.charCodeAt(i)>58 && user.charCodeAt(i)<65) || (user.charCodeAt(i)>122 && user.charCodeAt(i)<126) || user.charCodeAt(i)==91 || user.charCodeAt(i)==93 || user.charCodeAt(i)==94 || user.charCodeAt(i)==96) {erromail = 1}}
for (i=0; i<dominio.length; i++) {if (dominio.charCodeAt(i)<32 || dominio.charCodeAt(i)>169 || (dominio.charCodeAt(i)>32 && dominio.charCodeAt(i)<45) || (dominio.charCodeAt(i)>58 && dominio.charCodeAt(i)<65) || (dominio.charCodeAt(i)>122 && dominio.charCodeAt(i)<126) || dominio.charCodeAt(i)==91 || dominio.charCodeAt(i)==93 || dominio.charCodeAt(i)==94 || dominio.charCodeAt(i)==96) {erromail = 1}}
if (user.match(oUser)==null) {erromail = 1}
var atomPat=new RegExp("^" + atom + "$");
var domArr=dominio.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {if (domArr[i].search(atomPat)==-1) {erromail = 1}}
if (len < 2) {erromail = 1}
}else{erromail = 1}
}
}else{erromail = 1}

if (erromail == 1){alert(" E-mail\n");allowance=false;}
else{
if (allowance){window.open('','janela1','menubar=NO,status=NO,scrollbars=NO,resizable=NO,copyhistory=NO,toolbar=NO,location=NO,directories=NO,width=520,height=300,top='+topPos+',left='+leftPos);
}
}
return allowance}