var pictureArrayLEFT = new makeArray(

'<a href="imoveis.php"><IMG SRC="precos/rotativo1.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo2.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo3.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo4.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo5.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo6.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>',
'<a href="imoveis.php"><IMG SRC="precos/rotativo7.jpg" ALT="" WIDTH=228 HEIGHT=196 border="0"></a>')

function makeArray()
{
this.length = makeArray.arguments.length

for (var i = 0; i < this.length; i++)
this[i + 1] = makeArray.arguments[i]
}
function randNum (num)
{
var now = new Date();
var rand = Math.round(num * Math.cos(now.getTime()));

if (rand < 0) rand = - rand; if (rand == 0) rand++;

return rand;
}
//Imagem aparece

document.write (pictureArrayLEFT[randNum(pictureArrayLEFT.length)])