var html=new Array()

html[0]='<style>#headerholder {background-image:url(images/sm-header1.jpg);</style>';
html[1]='<style>#headerholder {background-image:url(images/sm-header2.jpg);</style>';
html[2]='<style>#headerholder {background-image:url(images/sm-header3.jpg);</style>';
html[3]='<style>#headerholder {background-image:url(images/sm-header4.jpg);</style>';
html[4]='<style>#headerholder {background-image:url(images/sm-header5.jpg);</style>';
html[5]='<style>#headerholder {background-image:url(images/sm-header6.jpg);</style>';
html[6]='<style>#headerholder {background-image:url(images/sm-header7.jpg);</style>';
html[7]='<style>#headerholder {background-image:url(images/sm-header8.jpg);</style>';
html[8]='<style>#headerholder {background-image:url(images/sm-header9.jpg);</style>';
html[9]='<style>#headerholder {background-image:url(images/sm-header10.jpg);</style>';
html[10]='<style>#headerholder {background-image:url(images/sm-header11.jpg);</style>';
html[11]='<style>#headerholder {background-image:url(images/sm-header12.jpg);</style>';
html[12]='<style>#headerholder {background-image:url(images/sm-header13.jpg);</style>';

var dothemath = Math.floor(Math.random()*html.length);
document.write(html[dothemath]);