myPix = new Array("/media/20080525_west_0643.jpg","/media/20080525_west_0667.jpg","/media/20080527_west-trip_0900.jpg")  //new array
 imgCt = myPix.length //set imgCt to number of items in array

function choosePic()
{
 if (document.images)
   {
   randomNum = Math.floor((Math.random() * imgCt))  //generate a random number
   document.myPhoto.src = myPix[randomNum] //choose an image based on the number
   }
}