function checkregform(){if($('username').value==""){alert("Please enter your username.");return false;}
if($('password').value==""||($('confirmpassword')&&$('confirmpassword').value=="")){alert("Please enter your password/Re-enter password.");return false;}
if($('confirmpassword')&&$('password').value!==$('confirmpassword').value){alert("[password] and [Re-enter password] is not the same.");return false;}
if($('email')&&$('email').value==""){alert("Please enter your email.");return false;}
if($('clientcode')&&$('clientcode').value==""){alert("Please enter your clientcode.");return false;}
return true;}
function checkloginform(){if($('username').value==""){alert("Please enter your username.");return false;}
if($('password')&&$('password').value==""){alert("Please enter your password.");return false;}
if($('clientcode')&&$('clientcode').value==""){alert("Please enter your clientcode.");return false;}
return true;}
function checkproform(){if($('oldpassword').value==""){alert("Please enter your oldpassword.");return false;}
if($('clientcode')&&$('clientcode').value==""){alert("Please enter your clientcode.");return false;}
return true;}