function start() {
  choosepic1();
  choosepic2();
  choosepic3();
}
window.onload = start;

var pix1 = new Array("polish dancers home.jpg", "cattle up home.jpg", "lloyd ranch drive home.jpg", "sullivan pond road spring home.jpg");
var pix2 = new Array("feb031.jpg", "feb051.jpg");
var pix3 = new Array("nov031.jpg", "jan051.jpg");	

function choosepic1(){
	randomNum = Math.floor((Math.random()*pix1.length));
	document.getElementById("picture1").src = pix1[randomNum];
}

function choosepic2(){
	randomNum = Math.floor((Math.random()*pix2.length));
	document.getElementById("picture2").src = pix2[randomNum];
}

function choosepic3(){
	randomNum = Math.floor((Math.random()*pix3.length));
	document.getElementById("picture3").src = pix3[randomNum];
}


<!--
if (document.images) {
    homebuttonup       = new Image();
    homebuttonup.src   = "featured1.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "featured2.gif" ;
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}
// -->