images = new Array(7);
images[0]='2';
images[1]='3';
images[2]='4';
images[3]='5';
images[4]='6';
images[5]='7';
images[6]='8';

index=Math.floor(Math.random() * images.length);

document.write('<img src="images/homepageMainImg_'+images[index]+'.jpg" width="398" border="0" alt="picture of English department activity">');