var totallinks=1
var ad=new Array(totallinks)

ad[0]="<a href=http://29175pf5vnj5-zd6mjwzzfvj0x.hop.clickbank.net/ target=_blank>Instant Letter<br>Writing Kit</a>"

var randomnumber=Math.floor(Math.random()*totallinks)

var cont=ad[randomnumber]
document.write(cont)