varLength = 1
var entryContent = new Array(varLength)

entryContent[0] = " <div align=\"center\"><a href=\"bp.php\"><img src=\"g1.gif\" border=\"0\"></a><br> <a href=\"exxon.php\"><img src=\"g2.gif\" border=\"0\"></a><br> <a href=\"shell.php\"><img src=\"g3.gif\" border=\"0\"></a><br></div>"

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

document.write (selectedContent)