var no = 5;    
var speed = 7; 
snow = new Array();
snow[0] = new Array("http://www.geocities.co.jp/HeartLand-Hanamizuki/8856/ichi_i9.gif",2);
snow[1]= new Array("http://www.geocities.co.jp/HeartLand-Hanamizuki/8856/ichi_i8.gif",2);
snow[2]= new Array("http://www.geocities.co.jp/HeartLand-Hanamizuki/8856/ichi_i5.gif",2);
snow[3]= new Array("http://www.geocities.co.jp/HeartLand-Hanamizuki/8856/ichi_i4.gif",2);
snow[4]= new Array("http://www.geocities.co.jp/HeartLand-Hanamizuki/8856/ichi_i6.gif",2);

var ns4up = (document.layers) ? 1 : 0;  
var ie4up = (document.all) ? 1 : 0;     
var dx, xp, yp;
var am, stx, sty;
var i, doc_width = 600, doc_height = 800;

if (ns4up) {
    doc_width = self.innerWidth;    
    doc_height = 500;
}
else if (ie4up) {
    doc_width = document.body.clientWidth;
    doc_height = 500;
}

dx = new Array();   
xp = new Array();    
yp = new Array();    
am = new Array();   
stx = new Array();   
sty = new Array();   
muki = new Array();  
var j = 0;

for (i = 0; i < no; ++ i) {    
    dx[i] = 0;                        
    xp[i] = Math.random()*doc_height;  
    yp[i] = Math.random()*doc_width;   
    am[i] = Math.random()*10;         
    stx[i] = 0.02 + Math.random()/10; 
    sty[i] = 0.7 + Math.random();     
    muki[i] = snow[j][1];             

    if (ns4up)                      
        document.write("<layer name=\"dot"+ i +"\" visibility=\"show\"><img src=\"" + snow[j][0] + "\" border=\"0\"></layer>");
               
    else if (ie4up)                 
        document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible;\"><img src=\"" + snow[j][0] + "\" border=\"0\"></div>");
               
    if (j == (snow.length-1))       
        j = 0;
    else
        j += 1;
}

document.write("<div id=\"damy\" style=\"POSITION: absolute; width:1; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: " + doc_width + "px;\"> </div>");

function snowNS() {  
    for (i = 0; i < no; ++ i) { 
        switch(muki[i]) {
            case 0:
                yp[i] += sty[i];
                if (yp[i] > doc_width) {
                    xp[i] = Math.random()*doc_height-am[i];
                    yp[i] = 0;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = self.innerWidth;
                    doc_height = self.innerHeight;
                }
                break;

            case 1:
                yp[i] -= sty[i];
                if (yp[i] < 0) {
                    xp[i] = Math.random()*(doc_height-am[i]);
                    yp[i] = doc_width;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = self.innerWidth;
                    doc_height = self.innerHeight;
                }
                break;

            case 2:
                yp[i] -= sty[i];
                if (yp[i] > doc_height) {
                    xp[i] = Math.random()*(doc_width-50);
                    yp[i] = 0;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = self.innerWidth;
                    doc_height = self.innerHeight -50;
                }
                break;

            case 3:
                yp[i] -= sty[i];
                if (yp[i] < -50) {
                    xp[i] = Math.random()*(doc_width-am[i]-30);
                    yp[i] = doc_height;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = self.innerWidth;
                    doc_height = self.innerHeight -50;
                }
                break;

            default:

        }

        switch(muki[i]) {
            case 0:
            case 1:
                dx[i] += stx[i];
                document.layers["dot"+i].top = xp[i] + am[i]*Math.sin(dx[i]);
                document.layers["dot"+i].left = yp[i];
                break;

            case 2:
            case 3:
                dx[i] += stx[i];
                document.layers["dot"+i].top = yp[i];
                document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
                break;

            default:
        }
    }

    setTimeout("snowNS()", speed);
}

function snowIE() {  
    for (i = 0; i < no; ++ i) {  
        switch(muki[i]) {   
            case 0:         
                yp[i] += sty[i];     
                if (yp[i] > doc_width) {   
                    xp[i] = Math.random()*(doc_width-am[i]);
                    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;
                }
                break;

            case 1:        
                yp[i] -= sty[i];
                if (yp[i] < 0) {
                    xp[i] = Math.random()*(doc_width-am[i]);
                    yp[i] = doc_width;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = document.body.clientWidth;
                    doc_height = document.body.clientHeight;
                }
                break;

            case 2:         
                yp[i] += sty[i];
                if (yp[i] > doc_height) {
                    xp[i] = Math.random()*(doc_width-50);
                    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;
                }
                break;

            case 3:         
                yp[i] -= sty[i];
                if (yp[i] < -50) {
                    xp[i] = Math.random()*(doc_height-am[i]-30);
                    yp[i] = doc_height;
                    stx[i] = 0.02 + Math.random()/10;
                    sty[i] = 0.7 + Math.random();
                    doc_width = document.body.clientWidth;
                    doc_height = document.body.clientHeight -50;
                }
                break;

            default:
        }

        switch(muki[i]) {
            case 0:
            case 1:
                dx[i] += stx[i];
                document.all["dot"+i].style.pixelTop = xp[i] + am[i]*Math.sin(dx[i]);
                document.all["dot"+i].style.pixelLeft = yp[i];
                break;

           case 2:
           case 3:
               dx[i] += stx[i];
               document.all["dot"+i].style.pixelTop = yp[i];
               document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
               break;
           default:
        }
    }
    setTimeout("snowIE()", speed);
}

if (ns4up)
    snowNS();
else if (ie4up)
    snowIE();