var mess = new Array(
'<div id="hdr_pic1"></div><!--Closing hdr_pic1-->',
'<div id="hdr_pic2"></div><!--Closing hdr_pic2-->',
'<div id="hdr_pic3"></div><!--Closing hdr_pic3-->',
'<div id="hdr_pic4"></div><!--Closing hdr_pic4-->',
'<div id="hdr_pic5"></div><!--Closing hdr_pic5-->',
'<div id="hdr_pic6"></div><!--Closing hdr_pic6-->');
var max = mess.length;
var num = Math.floor((Math.random() * max));
document.writeln(mess[num]);