/******************************************
* 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="images/snow.gif"
  // Configure below to change number of snow to render
  var no = 10;
  // 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();

	function createsnow()
	{
	    dx = new Array();
	    xp = new Array();
	    yp = new Array();
	    am = new Array();
	    stx = new Array();
	    sty = new Array();
	    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=\"uitleg.htm\"><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"
	}
	
	function showsnow(){
		for (i=0; i<no; i++) document.getElementById("dot"+i).style.visibility="visible"
	}
	
	function letItSnow(totalsnowflakes, image, beginJaar, beginMaand, beginDag, eindJaar, eindMaand, eindDag)
	{
		if (ie4up||ns6up)
		{
			no = totalsnowflakes
			snowsrc=image
			var beginDatum = new Date();
			var eindDatum = new Date();
			var vandaag = new Date();
			beginDatum.setDate(beginDag);
			beginDatum.setMonth(beginMaand-1);
			beginDatum.setYear(beginJaar);
			beginDatum.setHours(0, 0, 0, 0);
			eindDatum.setDate(eindDag);
			eindDatum.setMonth(eindMaand-1);
			eindDatum.setYear(eindJaar);
			eindDatum.setHours(23, 59, 59, 0);
//			window.alert( d );
//			window.alert( beginDatum );
//			window.alert( eindDatum );
//			window.alert( d >= beginDatum );
			if ( vandaag >= beginDatum && vandaag <= eindDatum ) {
				createsnow();
				snowIE_NS6();
				if (hidesnowtime > 0)
				{
				    setTimeout("hidesnow()", hidesnowtime * 1000);
				}
			}
		}

	}
	function letItSnowOld(totalsnowflakes, image)
	{
		if (ie4up||ns6up)
		{
			no = totalsnowflakes
			snowsrc=image
			createsnow();
//			showsnow();
			snowIE_NS6();
			if (hidesnowtime>0)
			{
				setTimeout("hidesnow()", hidesnowtime*1000);
			}
		}

	}
//	hidesnow();