[4684499]

Actually you can use simple CSS with styling extensions like Stylus to achieve similar effect.

    .ind img {
        height: 100%;
        border-right: 3px solid red;
    }

If you want different color for different level of indent, just use attribute selector, like:

    .ind img {
        height: 100%;
        border-right: 3px solid;
    }
    img[width="40"] {
        border-color: red;
    }
    img[width="80"] {
        border-color: blue;
    }

[Midnightas]

This fails for me, makes the bar a pixel tall. I knew I overcomplicated it, although I like doing that :P, thanks.

[4684499]

Sorry, I used these lines a few years back, I'm using other styles now so I didn't know it stopped working.

You are right, it's not working.

Edit: OK, I know what's going on now, you need to add this to the code above:

    .comtr table {
        height: 100%;
    }