Padající pírka

<script type="text/javascript">

    /******************************************
    * Snow Effect Script- By Altan d.o.o. (http://www.altan.hr/snow/index.html)
    * Visit Dynamic Drive DHTML code library (http://www.dynamicdrive.com/) for full source code
    * Last updated Nov 9th, 05' by DD. This notice must stay intact for use
    ******************************************/
     
      //Configure below to change URL path to the snow image
      var snowsrc="pirko.gif"
      // Configure below to change number of snow to render
      var no = 5;
      // Configure whether snow should disappear after x seconds (0=never):
      var hidesnowtime = 0;
      // Configure how much snow should drop down before fading ("windowheight" or "pageheight")
      var snowdistance = "windowheight";

    ///////////Stop Config//////////////////////////////////

      var ie4up = (document.all) ? 1 : 0;
      var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

       function iecompattest(){
       return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
       }

      var dx, xp, yp;    // coordinate and position variables
      var am, stx, sty;  // amplitude and step variables
      var i, doc_width = 800, doc_height = 600;
     
      if (ns6up) {
        doc_width = self.innerWidth;
        doc_height = self.innerHeight;
      } else if (ie4up) {
        doc_width = iecompattest().clientWidth;
        doc_height = iecompattest().clientHeight;
      }

      dx = new Array();
      xp = new Array();
      yp = new Array();
      am = new Array();
      stx = new Array();
      sty = new Array();
      snowsrc=(snowsrc.indexOf("dynamicdrive.com")!=-1)? "snow.gif" : snowsrc
      for (i = 0; i < no; ++ i) { 
        dx[i] = 0;                        // set coordinate variables
        xp[i] = Math.random()*(doc_width-50);  // set position variables
        yp[i] = Math.random()*doc_height;
        am[i] = Math.random()*20;         // set amplitude variables
        stx[i] = 0.02 + Math.random()/10; // set step variables
        sty[i] = 0.7 + Math.random();     // set step variables
          if (ie4up||ns6up) {
          if (i == 0) {
            document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><a href=\"http://dynamicdrive.com\"><img src='"+snowsrc+"' border=\"0\"><\/a><\/div>");
          } else {
            document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
          }
        }
      }

      function snowIE_NS6() {  // IE and NS6 main animation function
        doc_width = ns6up?window.innerWidth-10 : iecompattest().clientWidth-10;
          doc_height=(window.innerHeight && snowdistance=="windowheight")? window.innerHeight : (ie4up && snowdistance=="windowheight")?  iecompattest().clientHeight : (ie4up && !window.opera && snowdistance=="pageheight")? iecompattest().scrollHeight : iecompattest().offsetHeight;
        for (i = 0; i < no; ++ i) {  // iterate for every dot
          yp[i] += sty[i];
          if (yp[i] > doc_height-50) {
            xp[i] = Math.random()*(doc_width-am[i]-30);
            yp[i] = 0;
            stx[i] = 0.02 + Math.random()/10;
            sty[i] = 0.7 + Math.random();
          }
          dx[i] += stx[i];
          document.getElementById("dot"+i).style.top=yp[i]+"px";
          document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i])+"px"; 
        }
        snowtimer=setTimeout("snowIE_NS6()", 10);
      }

       function hidesnow(){
          if (window.snowtimer) clearTimeout(snowtimer)
          for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="hidden"
       }
          

    if (ie4up||ns6up){
        snowIE_NS6();
          if (hidesnowtime>0)
          setTimeout("hidesnow()", hidesnowtime*1000)
          }

    </script>