Two questions:

1. I got this error while validating my code:

Line 52, Column 7: end tag for "div" omitted, but OMITTAG NO was specified


You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".
The <body> tag is closed though... How could I fix this error?

2. Pretty much the same thing happened with a form tag. I had a </form> tag at the end of my form, I replaced it with a <form name="" ... /> self-closing tag and it passed validation... Could you please explain to me this issue, as well as its resolution?

For those who usually can't help, please no rolleyes smileys, rant about the purity of mark-up and the likes. I'm here to learn.