var maxAdNo = 3;
var adNo;
var billboard = new Array();
    billboard[0] = '<img src="http://bmec.wisc.edu/images/operation19106522.gif" width="150" height="240" border="0" align="right" alt="An operating room and medical professionals. Surgical instruments are in the foreground." />'
    billboard[1] = '<img src="http://bmec.wisc.edu/images/patientroom19302714.gif" width="150" height="240" border="0" align="right" alt="Medical professional and patient" />'
    billboard[2] = '<img src="http://bmec.wisc.edu/images/patientroom32141321.gif" width="150" height="240" border="0" align="right" alt="Medical professional and patient" />'
    billboard[3] = '<img src="http://bmec.wisc.edu/images/2005ARp6bmeWilliams.gif" width="240" height="150" border="0" align="right" alt="Drs. Charles Garell and Justin Williams" />'