//random number from 1 to N
var random = Math.floor(Math.random() * N + 1);
 
//random number from 1 to 10
//http://www.sharejs.com
var random = Math.floor(Math.random() * 10 + 1);
 
//random number from 1 to 100
var random = Math.floor(Math.random() * 100 + 1);
//javascript/8780