adboxes = new Array(4);

adboxes[0] = "<a href=\"http://www.euroasiatreks.com/\"><img src=\"http://www.nepalhomepage.com/travel/template/adboxes/shanker.gif\" border=1 width=120 height=60></a>";
adboxes[1] ="<a href=\"http://www.buddhaair.com/\"><img src=\"http://www.nepalhomepage.com/travel/template/adboxes/buddhaair.gif\" border=1 width=120 height=60></a>";
adboxes[2] ="<a href=\"http://www.marcopolo.com.np\"><img src=\"http://www.nepalhomepage.com/travel/template/adboxes/marco.gif\" border=1 width=120 height=60></a>";
adboxes[3] ="<a href=\"http://www.celtictrekking.com\"><img src=\"http://www.nepalhomepage.com/travel/template/adboxes/celtic.gif\" border=1 width=120 height=60></a>";

index1 = Math.floor(Math.random() * adboxes.length);
index2 = (index1 + 1) % adboxes.length;
index3 = (index1 + 2) % adboxes.length;

function adbox1() {
	document.write(adboxes[index1])
}

function adbox2() {
	document.write(adboxes[index2])
}

function adbox3() {
	document.write(adboxes[index3])
}