I manage to fix the problem on my own. Since the pic's where in editor, I had to load them manualy by myself using jquery.onload(); (and changed from width/height to css styles)
var $images = $(dom_zaj).find('img');
var imagesLength = $images.length;
$images.load(function(){
var w_native = this.naturalWidth;
$(this).css('width', w_native+'px');
imagesLength = imagesLength-1;
if(imagesLength === 0){
pz = dom_zaj.innerHTML;
zaj.SetHTML(pz);
}
}).error(function(){
imagesLength = imagesLength-1;
});