rimages = new Array();
rimages[rimages.length]='images/header-images/1.jpg';
rimages[rimages.length]='images/header-images/2.jpg';
rimages[rimages.length]='images/header-images/3.jpg';
rimages[rimages.length]='images/header-images/4.jpg';
rimages[rimages.length]='images/header-images/5.jpg';
rimages[rimages.length]='images/header-images/6.jpg';
rnum = Math.floor(Math.random() * rimages.length);
document.write("<img src='"+rimages[rnum]+"'>");