There a few problems.

1. void setup()
2.       {
3.             franeRate(5);
4.       }
6. int r1 = (int)random(8258,16789); 
   
   int r2 = (int)random(8258,16789); 
7. 
   
8. void draw()
   
         {
9.             if(millis()>=r1)
   
                     {
   
10.                         somecrap1
11.                   }
12.             if(millis()>=r2)
13.                   {
14.                         somecrap2
15.                   }
16.       }
17.   

Thx

This works, it's a rewrite of your code.  It's worth pointing out that r2 may be less than r1, and may trigger earlier.  Also, often, the time values are large - I've added printlns so you know how long you must wait to see the effect.