function slideIt()
{
	var slidingDiv = document.getElementById("timeline");
	if(parseInt(slidingDiv.style.top)==0){
		//GODOWN
		slideItUp();
		document.getElementById("history_nav").innerHTML = "1989 - 2000";
		document.getElementById("history_nav").className = "up";				
	}else{
		//GO UP
		slideItDown();
		document.getElementById("history_nav").innerHTML = "2001 - Present";
		document.getElementById("history_nav").className = "down";				
	}
}

function slideItUp()
{
	var slidingDiv = document.getElementById("timeline");
	var slideLimit = -521;
	if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
		slideLimit = -505;
	}

	if (parseInt(slidingDiv.style.top) > slideLimit )
	{
		slidingDiv.style.top = parseInt(slidingDiv.style.top) - 6 + "px";
		setTimeout(slideItUp, 1);
	}
}

function slideItDown()
{
	var slidingDiv = document.getElementById("timeline");
	if (parseInt(slidingDiv.style.top) < 0 )
	{
		slidingDiv.style.top = parseInt(slidingDiv.style.top) + 6 + "px";
		setTimeout(slideItDown, 1);
	}
}