function ImageChanger() {
  if (!document.getElementById) return
  
  var imageArray = document.getElementsByTagName('img');

  for (var i = 0; i < imageArray.length; i++) {    
    if (imageArray[i].className == 'imgover') {
      var src = imageArray[i].getAttribute('src');
      var suffix = src.substring(src.lastIndexOf('.'), src.length);
      var osrc = src.replace(suffix, '_o'+suffix);
      
      imageArray[i].setAttribute('nsrc', src);
      imageArray[i].setAttribute('osrc', osrc);
      
      preloadImage = new Image();
      preloadImage.src = osrc;
      
      imageArray[i].onmouseover = function() {
        this.setAttribute('src', this.getAttribute('osrc'));
      }
      
      imageArray[i].onmouseout = function() {
        this.setAttribute('src', this.getAttribute('nsrc'));
      }
    }
  }
}
try{
  window.addEventListener("load", ImageChanger,false);
    }catch(e){
  window.attachEvent("onload", ImageChanger);
}


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_preloadImages() { //v3.0
  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 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;
}

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];}
}