OH YES YES YES YES YES YES YES YES DEAR YES!!
No, please, no capital! Just 'jaja'! Pweeeeez! :3
'ja' can mean a lot of things in Japanese. For example, it also means 'snake'.
Weirdly, it also means 'yes'. Just an informal way of saying.
But it isn't even said as 'hae', it's 'hai'. xD