function subwin(url){
  win = window.open(url,"sub","width=500,height600,channelmode=no,directories=no,fullscreen=no,location=no,menubar=no,resizable=no,scrollbars=yes,status=yes,titlebar=yes,toolbar=no");
  win.focus();
}

function mainwin(url){
  window.opener.location.href=url;
  window.opener.focus();
  void(0);
}

function back(){
  history.go(-1);
}

function chgimg(imgname,imgurl){
  document.images[imgname].src = imgurl;
}

/*
function bgscrl(){
	if(document.body.scrollTop){
		scrTop=document.body.scrollTop.value;
	}else if(window.pageYOffset){
		scrTop=window.pageYOffset.value;
	}
	vPos = int(scrTop / 10);
    document.body.style.backgroundPosition= 0 + " " + vPos;
}
if(document.all || document.getElementById){
	window.onscroll = bgscrl();
	window.onload = bgscrl();
}
*/