function MM_preloadImages() {
  var d=document;
  if (d.images) {
     if (!d.MM_p) {
        d.MM_p=new Array();
     }
     var i,j=d.MM_p.length,a=MM_preloadImages.arguments;
     for (i=0; i<a.length; i++) {
         if (a[i].indexOf("#")!=0) {
            d.MM_p[j]=new Image;
            d.MM_p[j++].src=a[i];
         }
     }
  }
}

function choosePic() {
    if (document.images) {
       randomNum = Math.floor((Math.random()*3)) + 1;
       document.home_pic.src = "images/home_pic_" + randomNum + ".jpg";
    }
}

function chooseSidePic() {
    if (document.images) {
       randomNum = Math.floor((Math.random()*4)) + 1;
       document.side_pic.src = "images/side_pic_" + randomNum + ".jpg";
    }
}