This is a really annoying thing about editors I think, they strip out loads of html tags that could be a little dangerous - like javascript. Obviously they're totally right to do it and I'm glad they do but it sure is annoying!
Here's a little tip you can do
if you're the only person that administers your site (i.e. if others can write content for your site don't do this as
it will allow them to insert bad code!)
For JCE, if you go to the configuration page for the JCE mambot and add
in to the "Extended Elements" field it won't strip out things such as form tags etc. You can also add just
form[action|method],input[type|name|value|src]
to only allow forms - a little more secure but I use the first one as no body else is on my site
Tom.