VerifiqueTAB=true;
function Mostra(quem, tammax) {
   if ( (quem.value.length == tammax) && (VerifiqueTAB) ) { 
     var i=0,j=0, indice=-1;
     for (i=0; i<document.forms.length; i++) { 
       for (j=0; j<document.forms[i].elements.length; j++) { 
          if (document.forms[i].elements[j].name == quem.name) { 
            indice=i;
            break;
          } 
       } 
       if (indice != -1) break; 
     } 
     for (i=0; i<=document.forms[indice].elements.length; i++) { 
       if (document.forms[indice].elements[i].name == quem.name) { 
          while ( (document.forms[indice].elements[(i+1)].type == "hidden") &&
                  (i < document.forms[indice].elements.length) ) { 
             i++;
          } 
          document.forms[indice].elements[(i+1)].focus();
          VerifiqueTAB=false;
          break;
       } 
     } 
   } 
} 
function PararTAB(quem) { VerifiqueTAB=false; } 
function ChecarTAB() { VerifiqueTAB=true; }