var menu;
var theTop = 550;
var old = theTop;


window.onload=function(){
	menu = new getObj('menu');
	movemenu();

}



function movemenu()
{
	if (window.innerHeight)
	{
		  pos = window.pageYOffset
	}
	else if (document.documentElement && document.documentElement.scrollTop)
	{
		pos = document.documentElement.scrollTop
	}
	else if (document.body)
	{
		  pos = document.body.scrollTop
	}
	
	// top
	if (pos < theTop) {
			pos = theTop;
			document.getElementById('menu').style.position='absolute';
			document.getElementById('menu').style.top='550px';
	}			
	else {
	// scroll
	pos += 30;
			document.getElementById('menu').style.position='fixed';
			document.getElementById('menu').style.top='30px';
	}
	

	old = pos;
	temp = setTimeout('movemenu()',500);
}



function getObj(name)
{
  if (document.getElementById)
  {
  	this.obj = document.getElementById(name);
	this.style = document.getElementById(name).style;
  }
  else if (document.all)
  {
	this.obj = document.all[name];
	this.style = document.all[name].style;
  }
  else if (document.layers)
  {
   	this.obj = document.layers[name];
   	this.style = document.layers[name];
  }
}