Im trying to edit my myspace profile & luckily I did press "Enter" between each code but now Im wondering how do i tell the HTML codes apart?Counting the codes & graphics is obvious but in my "About Me" section I also have the layout code,scrollbar color codes,falling objects & other tweak HTML codes.So counting codes to graphics wont work for me.My question is how do I differentiate HTML codes & which is what?

The best way to differentiate HTML codes is to learn what each of them mean. :) If you could post your code here, we might be able to help you out a little, of course the best way to know is to actually know programming :D Some of the codes are self-explanatory as well, if you read them closely.

In CSS, you know when one function ends by finding the brackets pertaining to that function, i.e.:

<style>
A:link {
text-decoration: none;
}
</style>

So when you have an Active link, there is no 'text decoration' such as bold or underline. Sorry, that explanation was kind of haphazard :P