function isEmpty(pStrText){ 
   var   len = pStrText.length; 
   var pos; 
   var vStrnewtext = ""; 

   for (pos=0; pos<len; pos++){ 
      if (pStrText.substring(pos, (pos+1)) != " "){ 
         vStrnewtext = vStrnewtext + pStrText.substring(pos, (pos+1)); 
      } 
   } 

   if (vStrnewtext.length > 0) 
      return false; 
   else 
      return true; 
} 

function isEmail(text){ 
   var    arroba = "@", 
          ponto = ".", 
         posponto = 0, 
         posarroba = 0; 
    
    if (text =="") return false; 
    
    for (var indice = 0; indice < text.length; indice++){ 
       if (text.charAt(indice) == arroba) { 
          posarroba = indice; 
            break; 
       } 
    } 
    
   for (var indice = posarroba; indice < text.length; indice++){ 
      if (text.charAt(indice) == ponto) { 
         posponto = indice; 
           break; 
      } 
   } 
   if (posponto == 0 || posarroba == 0) return false; 
   if (posponto == (posarroba + 1)) return false; 
   if ((posponto + 1) == text.length) return false; 
   return true; 
}