varLength = 1
var entryContent = new Array(varLength)

entryContent[0] = " <div align=\"center\"><br> <img src=\"ad1.gif\" width=\"160\" height=\"160\" border=\"1\"><br><br><br><a href=\"advertising.php\"><img src=\"adsdollar.gif\" width=\"160\" height=\"160\" border=\"1\"></a><br><br><br> <img src=\"ad3.gif\" width=\"160\" height=\"160\" border=\"1\"><br><br><br> <img src=\"ad5.gif\" width=\"160\" height=\"160\" border=\"1\"><br> <br> </font></div>"

var randomNumber = Math.random()
randomNumber *= varLength
randomNumber = parseInt(randomNumber)
if(isNaN(randomNumber)) randomNumber = 0
else randomNumber %= varLength
selectedContent = entryContent[randomNumber]

document.write (selectedContent)