This program is based on the Diamond-Square algorithm.
You may check out http://gameprogrammer.com/fractal.html for a detailed description.
download http://qiao.github.com/fractal-terrain-generator/lib/terrain.js and include it in your html.
var terrain = ;
generateTerrain receives three parameters:
width: Segments of the width of the terrain.
height: Segments of the height of the terrain.
smoothness: Smoothness of the terrain. Higher this value, smoother the terrain will be. Recommended value is 1.
terrain will be a (width + 1) x (height + 1) 2-dimensional array containing the elevation of each vertex.