/* rotate the top margin image for science JMMay09 */
/* update numberofimages to match the number of images  */

var numberofimages = 5;

var topmarginimagerandomnumber=Math.floor((Math.random()*numberofimages)+1);
document.write("<style>#header{background:url(http://www.epa.gov/epahome/images/science" + topmarginimagerandomnumber + "topmarginimage.jpg) 0 0 no-repeat !important;}</style>");