// JavaScript Document

//スクロールスピード設定（数値が大きくなるとはやくなる）

var speed=3;




iens6=document.all||document.getElementById;

ns4=document.layers;




var crossobj;

var contentheight;




function pageload() {

  if (iens6){

    crossobj=document.getElementById? document.getElementById("content") : document.all.content;

    contentheight=crossobj.offsetHeight;

  }

  else if (ns4){

    crossobj=document.nscontainer.document.nscontent;

    contentheight=crossobj.clip.height;

  }

  getcontent_height();  

}




function movedown(){

  if (iens6&&parseInt(crossobj.style.top)>=(contentheight*(-1)+125))

    crossobj.style.top=parseInt(crossobj.style.top)-speed+"px";

  else if (ns4&&crossobj.top>=(contentheight*(-1)+125))

    crossobj.top-=speed;

  movedownvar=setTimeout("movedown()",20);

}




function moveup(){

  if (iens6&&parseInt(crossobj.style.top)<=0)

    crossobj.style.top=parseInt(crossobj.style.top)+speed+"px";

  else if (ns4&&crossobj.top<=0)

    crossobj.top+=speed;

  moveupvar=setTimeout("moveup()",20)

}




function getcontent_height(){

  if (iens6)

    contentheight=crossobj.offsetHeight;

  else if (ns4)

    document.nscontainer.document.nscontent.visibility="show";

}

window.onload=pageload;