var ie=document.all&&!window.opera?1:0;
var dom=document.getElementById?1:0;
var ns4=document.layers?1:0;

function dropIn()
{
	speed+=6; 
	if(parseInt(box.top)<scroll_top)
	{
		box.top=parseInt(box.top)+speed;
		in_timer=setTimeout("dropIn()",50);
	}
	else clearTimeout(in_timer);
}
function dropOut() 
{
	if(parseInt(box.top)>(-1)*boxheight) 
	{
		box.top=parseInt(box.top)-1;
		out_timer=setTimeout("dropOut()",1);
	}
	else clearTimeout(out_timer);
}
function init() 
{
	if(!(ie||dom||ns4||document.layers))
	{
		return;
	}
	else if(ie||dom)
	{
		box=$("dropbox").style;
		boxheight=$("dropbox").offsetHeight;
	}
	else if(ns4) 
	{
		box=document.dropbox;
		boxheight=box.clip.height;
	}
	scroll_top=(ie)?document.body.scrollTop:window.pageYOffset;
	box.top=scroll_top-boxheight;
	speed=1;
	dropIn();
}
window.onload=init;