var i=0;

function slide_up()
{
	var slidingDiv = document.getElementById("sliding_content");
	var curr_height =slidingDiv.offsetHeight;
	var stopPosition = (curr_height-(curr_height*2))+450;
	
	
	
	if ((parseInt(slidingDiv.style.top) > stopPosition )&& (i<100))
	{
		slidingDiv.style.top = parseInt(slidingDiv.style.top) - 5 + "px";
		i++;
		setTimeout(slide_up, 1);
	}
	else{
	i=0;	
	}
}

function slide_down()
{
	var slidingDiv = document.getElementById("sliding_content");
	var stopPosition = 0;
	
	if ((parseInt(slidingDiv.style.top) < stopPosition )&& (i<100))
	{
		slidingDiv.style.top = parseInt(slidingDiv.style.top) + 5 + "px";
		i++;
		setTimeout(slide_down, 1);
	}
	else{
	i=0;	
	}

}