function rand_number(n)
{
var x;
x=Math.round(Math.random()*100);
x%=n;
return x;
}
function property()
{
var img = new Array();

img[0]='<img src="images/pics/sidenav/01.jpg" alt="Click to view our online image library" width="159" height="100" border="0" />';
img[1]='<img src="images/pics/sidenav/02.jpg" alt="Click to view our online image library" width="159" height="100" border="0" />';
img[2]='<img src="images/pics/sidenav/03.jpg" alt="Click to view our online image library" width="159" height="100" border="0" />';
img[3]='<img src="images/pics/sidenav/04.jpg" alt="Click to view our online image library" width="159" height="100" border="0" />';
img[4]='<img src="images/pics/sidenav/05.jpg" alt="Click to view our online image library" width="159" height="84" border="0" />';
img[5]='<img src="images/pics/sidenav/06.jpg" alt="Click to view our online image library" width="159" height="120" border="0" />';
img[6]='<img src="images/pics/sidenav/07.jpg" alt="Click to view our online image library" width="159" height="100" border="0" />';

// attention, le nombre entre parenthese doit etre egal aux derniers entre crochet +1 exemple : ici 2+1=3

var n=rand_number(7); 
document.write(img[n]);
}