var ar = new Array(
	"<img src=html/smile1.jpg width=235 height=146 border=0>",
	"<img src=html/smile6.jpg width=235 height=146 border=0>",
	"<img src=html/smile7.jpg wdith=235 height=146 border=0>"
);

var num = Math.floor(Math.random() * ar.length);
document.write(ar[num]);