a = 21
var rand1 = Math.random();
var rand2 = Math.round(rand1 * (a-1))+1;

function create() {

    this.src = ' ';
    this.href = ' ';
    this.alt = ' ';

}
b = new Array();

for (var i = 1; i <= a; i++) {b[i]=new create() }

b[1].src = "indimage/001.jpg";
b[1].alt= "Crows Construction";

b[2].src = "indimage/002.jpg";
b[2].alt= "Crows Construction";

b[3].src = "indimage/003.jpg";
b[3].alt= "Crows Construction";

b[4].src = "indimage/004.jpg";
b[4].alt= "Crows Construction";

b[5].src = "indimage/005.jpg";
b[5].alt= "Crows Construction";

b[6].src = "indimage/006.jpg";
b[6].alt= "Crows Construction";

b[7].src = "indimage/007.jpg";
b[7].alt= "Crows Construction";

b[8].src = "indimage/008.jpg";
b[8].alt= "Crows Construction";

b[9].src = "indimage/009.jpg";
b[9].alt= "Crows Construction";

b[10].src = "indimage/010.jpg";
b[10].alt= "Crows Construction";

b[11].src = "indimage/011.jpg";
b[11].alt= "Crows Construction";

b[12].src = "indimage/012.jpg";
b[12].alt= "Crows Construction";

b[13].src = "indimage/013.jpg";
b[13].alt= "Crows Construction";

b[14].src = "indimage/014.jpg";
b[14].alt= "Crows Construction";

b[15].src = "indimage/015.jpg";
b[15].alt= "Crows Construction";

b[16].src = "indimage/016.jpg";
b[16].alt= "Crows Construction";

b[17].src = "indimage/017.jpg";
b[17].alt= "Crows Construction";

b[18].src = "indimage/018.jpg";
b[18].alt= "Crows Construction";

b[19].src = "indimage/019.jpg";
b[19].alt= "Crows Construction";

b[20].src = "indimage/020.jpg";
b[20].alt= "Crows Construction";

b[21].src = "indimage/021.jpg";
b[21].alt= "Crows Construction";

var image = "";
image += ' <td align="center" width="500" height="400" background="' + b[rand2].src + '">';