var haveerrors = 0;
function showImage(imagename, imageurl, errors){
document[imagename].src = imageurl;
if (!haveerrors && errors) haveerrors = errors;}


function validar_cadastro(a){
haveerrors = 0;
(a.login.value.length < 4)
? showImage("login", "imagens/icones/form_errado.gif", true)
: showImage("login", "imagens/icones/form_certo.gif", false);
(a.senha.value.length < 4)
? showImage("senha", "imagens/icones/form_errado.gif", true)
: showImage("senha", "imagens/icones/form_certo.gif", false);
(a.nome.value.length < 10)
? showImage("nome", "imagens/icones/form_errado.gif", true)
: showImage("nome", "imagens/icones/form_certo.gif", false);
(a.email.value.search("@") == -1 || a.email.value.search("[.*]") == -1) 
? showImage("email", "imagens/icones/form_errado.gif", true)
: showImage("email", "imagens/icones/form_certo.gif", false);
(a.endereco.value.length < 10)
? showImage("endereco", "imagens/icones/form_errado.gif", true)
: showImage("endereco", "imagens/icones/form_certo.gif", false);
(a.telefone.value.length < 8)
? showImage("telefone", "imagens/icones/form_errado.gif", true)
: showImage("telefone", "imagens/icones/form_certo.gif", false);
return (!haveerrors);}