// JScript File
function noVacio(elm) {
  if (elm.value == '' ||
    elm.value == null) 
  return false;
  else return true;
}

//valida si la fecha tiene el formato correcto
function valFecha(oTxt){  
  var bOk = true;  
  if (oTxt.value != ""){
    //alert(oTxt.value);
   bOk = bOk && (valAno(oTxt.value));  
   bOk = bOk && (valMes(oTxt.value));  
   bOk = bOk && (valDia(oTxt.value));  
   bOk = bOk && (valSep(oTxt.value));  
   return bOk;  
  }  
} 

function valDia(oTxt){  
  var bOk = false;  
  var nDia = parseInt(oTxt.substr(0, 2), 10);  
  bOk = bOk || ((nDia >= 1) && (nDia <= finMes(oTxt)));  
  return bOk;  
} 

function valMes(oTxt){  
  var bOk = false;  
  var nMes = parseInt(oTxt.substr(3, 2), 10);  
  bOk = bOk || ((nMes >= 1) && (nMes <= 12));  
  return bOk;  
}  

function valAno(oTxt){  
  var bOk = true;  
  var nAno = oTxt.substr(6);  
  bOk = bOk && ((nAno.length == 2) || (nAno.length == 4));  
  if (bOk){  
   for (var i = 0; i < nAno.length; i++){  
    bOk = bOk && esDigito(nAno.charAt(i));  
   }  
  }  
  return bOk;  
} 

function esDigito(sChr){  
  var sCod = sChr.charCodeAt(0);  
  return ((sCod > 47) && (sCod < 58));  
}   

function valSep(oTxt){  
  var bOk = false;  
  bOk = bOk || ((oTxt.charAt(2) == "-") && (oTxt.charAt(5) == "-"));  
  bOk = bOk || ((oTxt.charAt(2) == "/") && (oTxt.charAt(5) == "/")); 
  return bOk; 
}  

function finMes(oTxt){  
  var nMes = parseInt(oTxt.substr(3, 2), 10);  
  var nAno = parseInt(oTxt.substr(6), 10);  
  var nRes = 0;  
  switch (nMes){  
   case 1: nRes = 31; break;  
   case 2: nRes = 28; break;  
   case 3: nRes = 31; break;  
   case 4: nRes = 30; break;  
   case 5: nRes = 31; break;  
   case 6: nRes = 30; break;  
   case 7: nRes = 31; break;  
   case 8: nRes = 31; break;  
   case 9: nRes = 30; break;  
   case 10: nRes = 31; break;  
   case 11: nRes = 30; break;  
   case 12: nRes = 31; break;  
  }  
  return nRes + (((nMes == 2) && (nAno % 4) == 0)? 1: 0);  
}