var leftS =0;
var rightS =0;

function move(){
	slider = document.getElementById('slider');
	if(leftS != leftD){
		if(leftS < leftD) 
			leftS+=40;
		else 
			leftS-=40;
		slider.style.left = leftS+"px";
		setTimeout(move,20);
	}
}

function moveSlider(dest){
	leftD = dest;
	move();
}



function moveSliderToLeft(){
	moveSlider(-930);
	left_arrow 	= document.getElementById('left-arrow');
	right_arrow = document.getElementById('right-arrow');
	left_arrow.style.display 	= "none";
	right_arrow.style.display 	= "block";
}

function moveSliderToRight(){
	moveSlider(0);
	left_arrow 	= document.getElementById('left-arrow');
	right_arrow = document.getElementById('right-arrow');
	left_arrow.style.display 	= "block";
	right_arrow.style.display 	= "none";
}