I'm trying to integrate a [javascript library for drag&drop on tables](http://www.redips.net/javascript/drag-and-drop-table-content/) into one page of my custom Drupal module. I've included the js file using `drupal_add_js`, but I don't know how to initialize it.

The documentation for that library states that an init function should be called like

```
<body onload="REDIPS.drag.init()">

```

How would I do that in Drupal? Or has Drupal some better way of initializing the script?