var sliderLeft = 0;
var sliderCount = 4;
var slideInterval;
var slideTimer = 150;
var slideDirection = 0;
var slideStep = 0;
var slideSteps = 0;
var stepDuration = 10;
var slideLength = 0; //pixels
function slideLeft() {
	if (sliderLeft>=-100) return false;
	slideDirection = 1;
	slideSteps = slideTimer/stepDuration;
	slideInterval = setInterval(slide, stepDuration);
}

function slideRight() {
	slideDirection = -1;
	if (sliderLeft <= slideLength) return false;
	slideSteps = slideTimer/stepDuration;
	slideInterval = setInterval(slide, stepDuration);
}

function slide() {
	slideStep ++;
	if (slideStep > slideSteps)
	{
		slideStep = 0;
		clearInterval(slideInterval);
		return true;
	}
	increment = Math.abs(340) / slideSteps;
	el=document.getElementById('slider'); 
	sliderLeft = sliderLeft + increment * slideDirection;
	el.style.marginLeft= sliderLeft + 'px';
	
}

function loadImage(im) {
	el=document.getElementById('galleryMainImage'); 
	el.src = im.replace("_tn", "");
}