function valSep(oTxt){
    var bOk = false;
    var sep1 = oTxt.value.charAt(2);
    var sep2 = oTxt.value.charAt(5);
    bOk = bOk || ((sep1 == "-") && (sep2 == "-"));
    bOk = bOk || ((sep1 == "/") && (sep2 == "/"));
    return bOk;
   }

   function finMes(oTxt){
    var nMes = parseInt(oTxt.value.substr(3, 2), 10);
    var nAno = parseInt(oTxt.value.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);
   }

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

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

   function valAno(oTxt){
    var bOk = true;
    var nAno = oTxt.value.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 valFecha(oTxt,url){
    var bOk = true;
    if (oTxt.value != ""){
     bOk = bOk && (valAno(oTxt));
     bOk = bOk && (valMes(oTxt));
     bOk = bOk && (valDia(oTxt));
     bOk = bOk && (valSep(oTxt));
     if (!bOk){
      alert("Fecha inv&aacute;lida");
      oTxt.value = "DD/MM/AAAA";
      oTxt.focus();
     } else{ 
			document.form.action=url;
			document.form.submit();
			}
    }
   }
   
   //**********************************************************************************************
   function mail(mail)
	{
		var cont,ind1,ind2,ind3,ind4;
		mail = mail.value;
		cont=mail.length;
		ind1=mail.indexOf('@');
		ind2=mail.indexOf('.');
		ind3=mail.lastIndexOf('@');
		ind4=mail.lastIndexOf('.');
       	if ((ind1<=0)||(ind3>ind4)||(ind3!=ind1)||(ind4+2>cont)||(ind4+5<cont)||(ind3==ind4-1))
		{
			return 0;
		}else{
			return 1;
		}
	}
	
	//*********************************************************************************************
	
function valida() 
	{
	var ok=1;
	if (document.form.grpName.value=='') {ok=0; alert("El nombre del grupo es un campo obligatorio");}
	if (mail(document.form.repEmail)==1){} else {ok=0; alert("El correo eletrónico que has introducido no es valido");}
	if (ok==0)
		{alert("Debe rellenar correctamente el formulario");}
	else
		{document.form.submit();}
	}