var snow_no = 11; // snow number
var snow_speed = 15; // smaller number moves the snow faster
var snow_flakes = new Array("http://shared.guweb.com/bgfx/stars/stern09.gif");
var snow_reverse = 0;


/*
Basic script for all snow-like background animations
Original script source unknown, but found as public domain code on a JavaScript site
Many modifications by NOVASYS.
Distribution prohibited.

---

This new version should be included in the HTML page AFTER some JavaScript variables
have been initialized. These are:

var snow_no = 10;   		// number of "snow flakes"
var snow_speed = 15;		// moving speed (smaller value=faster)
var snow_flakes = array(...)	// array with flake images (min. 1 item)
var snow_reverse = 1;		// set if "flakes" should fly upwards

snow_speed is simply the update interval in milliseconds.

*/

if (!snow_reverse) var snow_reverse=0;

var ns4up = (document.layers) ? 1 : 0;  // browser sniffer
var ie4up = (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) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
} else if (ie4up) {
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}
*/

// This method works regardless of browser brand:
doc_width = self.innerWidth;
doc_height = self.innerHeight;
if (!doc_width) {
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
}

var bgfxint;

dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
var flakeid=0;
var code="";
for (i = 0; i < snow_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
    
    snowflake = snow_flakes[flakeid];
    
    if (ns4up) {                      // set layers
        document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
        document.write("top=\"15\" visibility=\"show\"><img src=\"");
        document.write(snowflake + "\" border=\"0\"></layer>");
    } else /*if (ie4up)*/ {
		// this method is used for any browser...
		code += '<div id="dot' + i + '" '
			+ 'style="POSITION: absolute; '
				+ 'Z-INDEX: '+ i +'; '
				+ 'VISIBILITY: visible; '
				+ 'TOP: 15px; '
				+ 'LEFT: 15px;">'
			+ '<img src="' + snowflake + '" border="0"></div>';
   }
   
   flakeid++;
   if (flakeid >= snow_flakes.length) flakeid=0;
}

var mydiv;
if (document.getElementById)
	mydiv = document.getElementById("bgfxdiv");
	
if (mydiv) {
	mydiv.innerHTML = code;
} else {
alert('document.write: '+code);
	document.write('<div id="bgfxdiv">' + code + '</div>');
}

function snowNS() {  // Netscape main animation function
    for (i = 0; i < snow_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];
	if (snow_reverse)
	    document.layers["dot"+i].top = doc_height - yp[i]  + window.pageYOffset - 50;
	else
	    document.layers["dot"+i].top = yp[i]  + window.pageYOffset;
	document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i])  + window.pageXOffset;
    }
    bgfxint = setTimeout("snowNS()", snow_speed);
}

function snowIE() {  // IE main animation function
    for (i = 0; i < snow_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 = document.body.clientWidth;
	    doc_height = document.body.clientHeight;
	}
	dx[i] += stx[i];
	if (snow_reverse)
	    document.all["dot"+i].style.pixelTop = doc_height - yp[i] + document.body.scrollTop - 50;
	else
	    document.all["dot"+i].style.pixelTop = yp[i] + document.body.scrollTop;
	document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]) + document.body.scrollLeft;
    }
    bgfxint = setTimeout("snowIE()", snow_speed);
}


function snowOther() {  // last resort animation function (used for FireFox, for example)

    ofsX = document.body.scrollLeft;
    ofsY = document.body.scrollTop;
    
    if (!ofsX) {
	ofsX = window.pageXOffset;
	if (!ofsX) ofsX=0;
    }
    if (!ofsY) {
	ofsY = window.pageYOffset;
	if (!ofsY) ofsY=0;
    }

    for (i = 0; i < snow_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 = document.body.clientWidth;
	    doc_height = document.body.clientHeight;
	}
	dx[i] += stx[i];
	dot = document.getElementById("dot"+i);
	
	if (snow_reverse)
	    newY = doc_height - yp[i] + ofsY - 50;
	else
	    newY = yp[i] + ofsY;
	
	if (dot.style) {
	    if (dot.style.pixelTop) {
        	dot.style.pixelTop = newY;
		dot.style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]) + ofsX;
	    } else {
		dot.style.top = newY;
		dot.style.left = xp[i] + am[i]*Math.sin(dx[i]) + ofsX;
	    }
	} else return; // interrupt animation (browser not supported)
    }
    bgfxint = setTimeout("snowOther()", snow_speed);
}

if (ns4up) {
    snowNS();
} else if (ie4up) {
    snowIE();
} else {
    // check if we can find the snow
    if (document.getElementById) {
		anysnow = document.getElementById('dot0');
		if (anysnow) snowOther();
    }     
}

function bgfx_stop() {
	if (bgfxint) {
		clearTimeout(bgfxint);
	}
	
	if (document.getElementById)
		mydiv = document.getElementById("bgfxdiv");	
	if (mydiv) mydiv.innerHTML="";
}