how to add map layer overlays in openlayers?

Question

i have 3 shapefile ready in a map file, and rendering it on mapserver. what i need is to and these layer overlay one over the other.how can i do this

Answer 1

Would this help?

for your question in the comment,

General openlayers examples You'll also find Geoext useful.

In the examples, you can see the different ways to add a layer to open layers