var how_many_ads = 12;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
url="/utk/default.htm?homelink=exhibit_0";
alt="Uniting the Kingdoms 1066 - 1603 exhibition";
pic="/exhibitions/images/rotate_utk.jpg";
}

if (ad==2) {
url="/education/britain1906to1918/default.htm?homelink=exhibit_1";
alt="Britain 1906 - 1918 exhibition";
pic="/exhibitions/images/rotate_britain1906-1918.jpg";
}

if (ad==3) {
url="/education/candp/default.htm?homelink=exhibit_2";
alt="Crime and Punishment exhibition";
pic="/exhibitions/images/rotate_crime_punishment.jpg";
}

if (ad==4) {
url="/education/focusoncensus/default.htm?homelink=exhibit_3";
alt="Focus on... The Census exhibition";
pic="/exhibitions/images/rotate_census.jpg";
}


if (ad==6) {
url="/education/greatwar/default.htm?homelink=exhibit_5";
alt="The Great war 1914 to 1918 exhibition";
pic="/exhibitions/images/rotate_greatwar.jpg";
}

if (ad==7) {
url="/spies/default.htm?homelink=exhibit_6";
alt="Secrets & Spies exhibition";
pic="/exhibitions/images/rotate_secrets_spies.jpg";
}

if (ad==8) {
url="/nelson/default.htm";
alt="Nelson, Trafalgar & those who served";
pic="/exhibitions/images/nelson_rotate.jpg";
}

if (ad==9) {
url="/theartofwar/default.htm?artofwar=13";
alt="The National Archives presents The Art of War";
pic="/exhibitions/images/rotate_artofwar.jpg";
}

if (ad==10) {
url="/films/";
alt="Public Information Films from 1945 - 1951";
pic="/exhibitions/images/rotate_pi_films.jpg";
}

if (ad==11) {
url="/domesday/";
alt="Learn how and why Domesday was created, the differences between Great and Little Domesday";
pic="/exhibitions/images/rotate-domesday.jpg";
}

if (ad==12) {
url="/horrors/";
alt="Horrors of The National Archives - From ghostly encounters and witchcraft to Jack the Ripper";
pic="/exhibitions/images/rotate-horrors.jpg";
}

document.write('<td width="32%" class="exflashbox" valign="bottom"><div class="exflashbox">');
document.write('<a href="' + url + '">'); 
document.write('<img src="' + pic + '" width="288" height="148" alt="' + alt + '" border="0" /></a></div></td>');         
;