function makeArray(n) { 
this.length = n; 
for (var i=1; i<=n; i++) { 
this[i] = ""; 
} 
return this; 
} 
var i; 
function imgalea() { 
i = Math.floor(7 * Math.random() + 1); 
return img[i]; 
} 
img = new makeArray(5); 
img[1]="imageb/image1.jpg"; 
img[2]="imageb/image2.jpg"; 
img[3]="imageb/image3.jpg"; 
img[4]="imageb/image4.jpg"; 
img[5]="imageb/image5.jpg"; 
img[6]="imageb/image6.jpg"; 
img[7]="imageb/image7.jpg";