var imgs = new Array();
var onload_items = new Array();

function rollover() {
  obj = getElementsByClassName('rollover');
  for (var i in obj) {
    obj[i].imgsrc = obj[i].src;
    obj[i].imgext = obj[i].imgsrc.substring(obj[i].imgsrc.lastIndexOf('.'), obj[i].imgsrc.length);
    obj[i].imgsrc_o = obj[i].imgsrc.replace(obj[i].imgext, '_o'+obj[i].imgext);
    obj[i].onmouseover = function () { this.src = this.imgsrc_o; }
    obj[i].onmouseout = function () { this.src = this.imgsrc; }
    imgs[imgs.length] = obj[i].imgsrc_o;
  }
}
onload_items[onload_items.length] = rollover;

function preloadimages(){
  var onImgs = new Array();
  for (field in imgs) {
    onImgs[field] = new Image();
    onImgs[field].src = imgs[field];
  }
}
onload_items[onload_items.length] = preloadimages;

window.onload = function() { for (var i in onload_items) onload_items[i]() }

// copied from prototype.js v1.3.1
// http://prototype.conio.net/
function getElementsByClassName (className) {
  var children = document.getElementsByTagName('*') || document.all;
  var elements = new Array();
  for (var i = 0; i < children.length; i++) {
    var child = children[i];
    var classNames = child.className.split(' ');
    for (var j = 0; j < classNames.length; j++) {
      if (classNames[j] == className) {
        elements.push(child);
        break;
      }
    }
  }
  return elements;
}



function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}