function checkform(){
	if (document.loginbox.userid.value.length ==0){
		alert("No User Name!");
		document.loginbox.userid.focus();
		return false;
	}
	if (document.loginbox.password.value.length==0){
		alert("No Passwords!");
		document.loginbox.password.focus();
		return false;
	}
	if (document.loginbox.verifycode.value.length==0){
		alert("No Verify Code!");
		document.loginbox.verifycode.focus();
		return false;
	}
	return true;
}