var guys=new Array()

guys[0]='<img src="http://www.rockitlearning.com/images/red_guy.jpg">'
guys[1]='<img src="http://www.rockitlearning.com/images/purple_guy.jpg">'
guys[2]='<img src="http://www.rockitlearning.com/images/green_guy.jpg">'
guys[3]='<img src="http://www.rockitlearning.com/images/blue_guy.jpg">'


var ts=Math.floor(Math.random()*(guys.length))
document.write(guys[ts])