var cookieSnieg = 'snieg';
function ukryjSnieg() {
   time = new Date();
   time.setTime(expires = (30*24*3600*1000) + time.getTime());
   expires = (time.toGMTString());
   document.cookie = cookieSnieg+'='+escape(1)+'; expires='+expires;
   location.reload();
}

function pokazSnieg() {
   time = new Date();
   time.setTime(expires = (30*24*3600*1000) + time.getTime());
   expires = (time.toGMTString());
   document.cookie = cookieSnieg+'='+escape(0)+'; expires='+expires;
   location.reload();
}



var snowsrc="gfx/snow.gif";
var no = 15;
var hidesnowtime = 0;
var snowdistance = "windowheight";
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

if (unescape(document.cookie).indexOf(cookieSnieg+'=1') < 0) {
	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;\"><img src='"+snowsrc+"' border=\"0\"><\/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 (unescape(document.cookie).indexOf(cookieSnieg+'=1') < 0) {
   if (ie4up||ns6up) {
      snowIE_NS6();
      if (hidesnowtime>0) setTimeout("hidesnow()", hidesnowtime*1000)
   }
}