How to add a fraction through javascript?

I am making a custom explanation of how to solve some math problems, and it requires manually adding latex through javascript. For example: HTML: <div id='printContainer'></div>

JS:

var x = 5;
 var y = 4; 
document.getElementById('parseContainer').innerHTML = '\frac{' + x + '+_2' +y + '_2}{2}';

The result will look like this: http://i.imgur.com/nvq5yma.png Is it possible to directly add latex through js? Thanks.

Thank you for responding very quickly to my question. What do you mean by escaping my quotes? I understand what that means, but I don't understand how it applies here. Can you show me an example? Sorry.

I suspect you need to escape your '\' in \frac. i.e.

document.getElementById('parseContainer').innerHTML = '\\frac{' + x + '+_2' +y + '_2}{2}'