function initialize_slider() {
	var scroll_width = 87;
	document.getElementById('slider_list').style.marginLeft = '0px';
	
	document.getElementById('slider_right_nav').onclick = function() {
		var curPlace = parseInt(document.getElementById('slider_list').style.marginLeft);
		if(!curPlace) {
			document.getElementById('slider_list').style.marginLeft = '-'+scroll_width+'px';	
		} else {
			if(curPlace > -(scroll_width * 4) && curPlace%scroll_width == 0) {
				var nextPlace = curPlace - scroll_width;
				document.getElementById('slider_list').style.marginLeft = nextPlace + 'px';
			}
		}
		return false;
	}

	document.getElementById('slider_left_nav').onclick = function() {
		var curPlace = parseInt(document.getElementById('slider_list').style.marginLeft);
		if(curPlace) {
			if(curPlace < 0 && curPlace%scroll_width == 0) {
				var nextPlace = curPlace + scroll_width;
				document.getElementById('slider_list').style.marginLeft = nextPlace  + 'px';
			}
		}
		return false;
	}
}