var baseImgUrl ="http://graphics.fansonly.com/schoolslt/beth/graphics/";
var imageRandNumber=Math.floor(Math.random()*3)+1;
function randomMasthead(){
document['mastheadRight'].src= baseImgUrl + 'beth-06-head-r-0' +imageRandNumber+ '.jpg';
//document.getElementById("mastheadRight").style.backgroundImage = 'url(' + baseImgUrl + 'beth-06-head-r-0' +imageRandNumber+ '.jpg)';
//alert(document['mastheadRight'].src);
}
randomMasthead();