Writing Equations in Blogspot Blogs

I can write equations in blogspot using latex command: $1+x^2$.

The Function \[\frac{sin(x)}{x}\] .

Since I did not include the p tag to it, it was not interpreted.
http://www.codecogs.com/pages/forums/pagegen.php?id=1675

However, If I add the p html-tag, it will appear as:

The Function \[\frac{sin(x)}{x}\] .

One can also type the latex and paste in the blog posts...
http://codecogs.izyba.com/latex/eqneditor.php
Just remember to put

<script type="text/javascript" src="http://latex.codecogs.com/latex.js"></script>

in the post
I am not sure how to change the dark background...