// JavaScript Document
/*
Snow Effect Script
Submitted by Altan d.o.o. (snow@altan.hr, http://www.altan.hr/snow/index.html)
Permission granted to Dynamicdrive.com to feature script in archive
For full source code to this script, visit http://dynamicdrive.com
*/

  //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;

  var ns4up = (document.layers) ? 1 : 0;  // browser sniffer
  var ie4up = (document.all) ? 1 : 0;
  var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

  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 (ns4up||ns6up) {
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
  } else if (ie4up) {
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
  }

  dx = new Array();
  xp = new Array();
  yp = new Array();
  am = new Array();
  stx = new Array();
  sty = new Array();

function prepareSnow() {
  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 (ns4up) {                      // set layers
      if (i == 0) {
        document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"></layer>");
      } else {
        document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"></layer>");
      }
    } else 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 snowNS() {  // Netscape main animation function
    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();
        doc_width = self.innerWidth;
        doc_height = self.innerHeight;
      }
      dx[i] += stx[i];
      document.layers["dot"+i].top = yp[i];
      document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
    }
    setTimeout("snowNS()", 10);
  }

  function snowIE_NS6() {  // IE and NS6 main animation function
    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();
        doc_width = ns6up?window.innerWidth : document.body.clientWidth;
        doc_height = ns6up?window.innerHeight : document.body.clientHeight;
      }
      dx[i] += stx[i];
      if (ie4up){
      document.all["dot"+i].style.pixelTop = yp[i];
      document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
      }
      else if (ns6up){
      document.getElementById("dot"+i).style.top=yp[i];
      document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i]);
      }   
    }
    setTimeout("snowIE_NS6()", 10);
  }

function messageWindow(title, msg)
{
  var width="300", height="125";
  var left = (screen.width/2) - width/2;
  var top = (screen.height/2) - height/2;
  var styleStr = 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbar=no,resizable=no,copyhistory=yes,width='+width+',height='+height+',left='+left+',top='+top+',screenX='+left+',screenY='+top;
  var msgWindow = window.open("","msgWindow", styleStr);
  var head = '<head><title>'+title+'</title></head>';
  var body = '<center>'+msg+'<br><p><form><input type="button" value="   Done   " onClick="self.close()"></form>';
  msgWindow.document.write(head + body);
}

function TodayIsInRange(strDate1, strDate2) {
    // strDate1 and strDate have to respect the format YYYYMMDD absolutely or it won't work !
	todaysdate = new Date();
    date = todaysdate.getDate(); // day of the month (1..31)
    day = todaysdate.getDay() + 1; // day of the week : 0 = sunday, etc.
	strDay = '' + date.toString();
    if (strDay.length == 1)
	  strDay = '0' + strDay;
    month = todaysdate.getMonth() + 1;
	strMonth = '' + month.toString();
    if (strMonth.length == 1)
	  strMonth = '0' + strMonth;
    yy = todaysdate.getYear();
    year = (yy < 1000) ? yy + 1900 : yy;
    year2 = 2000 - year; year2 = (year2 < 10) ? "0" + year2 : year2;	
	strYear = '' + year.toString();
	// make a string with year month and day
	strToday = '' + strYear + '' + strMonth + '' + strDay

    //messageWindow("Debug", "Date is " + strToday);
	
    if (parseFloat(strDate1) <= parseFloat(strToday) && parseFloat(strDate2) >= parseFloat(strToday))
		return(true);
	else
		return(false);
}
  // Display snow between two dates (range)
  if (TodayIsInRange("20061210", "20070110") == true) {
    prepareSnow();
    if (ns4up) {
      snowNS();
    } else if (ie4up||ns6up) {
      snowIE_NS6();
    }
  }