How do I use jquery to highlight the link when I click on it?
For example, when I click on the link class1_1, I want to make this link red (or another color).
You can do it using the CSS pseudo-class active. It adds special style to an activated element.
For example you can do this:
a: active { color: red; }
Be careful, a:active MUST come after a:hover in the CSS definition in order to be effective!!