max_width = 700;

if(document.documentElement.outerHTML == null) {
   HTMLElement.prototype.__defineSetter__("outerHTML", function (sHTML) {
   var r = this.ownerDocument.createRange();
   r.setStartBefore(this);
   var df = r.createContextualFragment(sHTML);
   this.parentNode.replaceChild(df, this);
});
}

function resizeImages() {
   for(var i=0; i<document.images.length; i++)
   {
      var img = document.images[i];
      if(img.className == "img_tag") {
         if(img.width > max_width) {
            var strNewHTML = '<a href= "' + img.src + '" target="_blank"><img width = "' + max_width + '" src="' + img.src + '" border=0 alt="" /></a>';
            img.outerHTML = strNewHTML;
         }
      }
   }
}

if (window.addEventListener) {
  window.addEventListener('load', resizeImages, false);
} else if (window.attachEvent) {
  window.attachEvent('onload', resizeImages);
} else {
  window.onload = resizeImages;
}