function insertRndPix() {
var d = document.getElementById("rndpix");
var n = Math.floor(Math.random()*10)+1;
var s = "<a href='http://cheminfo.informatics.indiana.edu/~rguha/rndpix/img"+n+".jpg'>";
s=s+"<img src='http://cheminfo.informatics.indiana.edu/~rguha/rndpix/img"+n+".jpg' border=0 width='174' /></a>";
d.innerHTML = s;
}