function checkbak()
{
if(String(document.giris.email.value).length<8 || String(document.giris.email2.value).length<8 || document.giris.email.value!=document.giris.email2.value)
alert("Mail Address is false");
else if(String(document.giris.user.value).length<8 || String(document.giris.user.value).length>20)
alert("Username is false");
else if(document.giris.ad.value=="" || document.giris.soyad.value=="")
alert("Your name and surname are null");
else if(document.giris.pasaport.value=="")
alert("Pasaport number is false");
else if(document.giris.sec1.value=="" || document.giris.sec2.value=="" || document.giris.sec3.value=="")
alert("Your birthday is null");
else if(String(document.giris.cep.value).length>10 || String(document.giris.cep.value).length<10)
alert("Your telephone number is false");
else
document.giris.submit();  
return false;
}

function checkbox()
{
if(document.girin.ad.value=="" || document.girin.soyad.value=="")
alert("Your name and surname are null");
else if(document.girin.sec1.value=="" || document.girin.sec2.value=="" || document.girin.sec3.value=="")
alert("Your birthday is null");
else
document.girin.submit();  
return false;
}

function checkle()
{
if(document.girisler.pasaport.value=="")
alert("Pasaport number is false");
else
document.girisler.submit();  
return false;
}

function sonbak()
{
if(String(document.grs.cep.value).length>10 || String(document.grs.cep.value).length<10)
alert("Your telephone number is false");
else
document.grs.submit();  
return false;
}

function uyeler()
{
if(String(document.gir.user.value).length<8 || String(document.gir.user.value).length>20)
alert("Username is false");
else if(String(document.gir.pass.value).length>8 || String(document.gir.pass.value).length<8)
alert("Your Password is null");
else
document.gir.submit();  
return false;
}

function checklenen()
{
if(String(document.giriste.user.value).length<8 || String(document.giriste.user.value).length>20)
alert("Please Check Your User Name Wrong");
else
document.giriste.submit();  
return false;
}

function checklesene()
{
if(String(document.giristen.baslik.value).length<3)
alert("Your Subject is null");
else if (String(document.giristen.mesaj.value).length<3)
alert("Your Message is null");
else if (String(document.giristen.mesaj.value).length>20000)
alert("Your Message is too long");
else
document.giriste.submit();  
return false;
}