What's more appropriate than a Spiral for Easter Code Golf sessions?
Well, I guess almost anything.

The Challenge

The shortest code by character count to display a nice ASCII Spiral made of asterisks ('*').

Input is a single number, R, that will be the x-size of the Spiral. The other dimension (y) is always R-2. The program can assume R to be always odd and >= 5.

Some examples:

Input
    7
Output

*******
*     *
* *** *
*   * *
***** *                   

Input
    9
Output

*********
*       *
* ***** *
* *   * *
* *** * *
*     * *
******* *

Input
   11
Output

***********
*         *
* ******* *
* *     * *
* * *** * *
* *   * * *
* ***** * *
*       * *
********* *

Code count includes input/output (i.e., full program). Any language is permitted.

My easily beatable 303 chars long Python example:

import sys;
d=int(sys.argv[1]);
a=[d*[' '] for i in range(d-2)];
r=[0,-1,0,1];
x=d-1;y=x-2;z=0;pz=d-2;v=2;
while d>2:
    while v>0:
        while pz>0:
            a[y][x]='*';
            pz-=1;
            if pz>0:
                x+=r[z];
                y+=r[(z+1)%4];
        z=(z+1)%4; pz=d; v-=1;
    v=2;d-=2;pz=d;
for w in a:
    print ''.join(w);

Now, enter the Spiral...