function addIframe(nr, ur, x, y, h, w, mw, mh, scr, frbo, pos, vm, alp, br, st, co) {
         if (!document.getElementById('iframe'+nr)) {
            nrr = Number(nr)+1;
            mozalp = alp*0.01;
            d_vbs = document.getElementById('srodek');
            yyy = Number(d_vbs.offsetTop)+Number(y);
            xxx = Number(d_vbs.offsetLeft)+Number(x);
            styl = 'z-index:'+nrr+';filter:Alpha(Opacity='+alp+');-moz-opacity: '+mozalp+';'
            +'position: '+pos+';border: '+br+'px '+st+' '+co+';visibility: '+vm+';'
            +'left: '+xxx+'px;top: '+yyy+'px;"';
            if (typeof HTMLElement != "undefined"){
               obj = document.createElement("iframe");
               obj.setAttribute("src", ur);
               obj.setAttribute("id", "iframe"+nr);
               obj.setAttribute("width", w);
               obj.setAttribute("height", h);
               obj.setAttribute("frameborder", frbo);
               obj.setAttribute("marginwidth", mw);
               obj.setAttribute("marginheight", mh);
               obj.setAttribute("style",styl);
               d_vbs.appendChild(obj);
            } else {     
               d_vbs.insertAdjacentHTML('beforeEnd',
               '<iframe src="'+ur+'" id="iframe'+nr+'" scrolling="'+scr+'" frameborder="'+frbo+'" '
               +'marginwidth="'+mw+' marginheight="'+mh+'" width="'+w+'" height="'+h+'" '
               +'style="'+styl+'></iframe>');
            }
         }
      }

      function deleteIframe(nr) {
         if (document.getElementById('iframe'+nr)) {
            document.getElementById('srodek').removeChild(document.getElementById('iframe'+nr));
         }
      }