function showID(idName){ 
if ( document.getElementById )
document.getElementById( idName ).style.visibility   = 'visible' 
else if ( document.all ) document.all( idName ).style.visibility = 'visible' 
else if ( document.layers ) document.layers[ idName ].visibility = 'show' 
}

function hideID(idName){ 
if ( document.getElementById )
document.getElementById( idName ).style.visibility   = 'hidden' 
else if ( document.all ) document.all( idName ).style.visibility = 'hidden' 
else if ( document.layers ) document.layers[ idName ].visibility = 'hide' 
}

function imgtop(){
var img=new Array()
img[0]="http://www.murose.com/home/img/1.jpg"
img[1]="http://www.murose.com/home/img/2.jpg"
img[2]="http://www.murose.com/home/img/3.jpg"
img[3]="http://www.murose.com/home/img/4.jpg"
img[4]="http://www.murose.com/home/img/5.jpg"

var r=Math.floor(Math.random()*img.length)
document.write('<img src="../../file/js/%27+img%5Br%5D+%27" width=480 height=480>');
}

function scrolly() {
if(navigator.appName == "Microsoft Internet Explorer" && document.compatMode == "CSS1Compat") {
sctop = document.body.parentNode.scrollTop;
}
else if(window.pageYOffset){
sctop = window.pageYOffset;
} else {
sctop = document.body.scrollTop;
}
if(sctop){
scup = Math.ceil(sctop*.2);
scrollBy(0,-scup);
if (sctop-scup) setTimeout("scrolly()",20);
}
}