var a=14;
function sizetoincrease()
{
    if(a<23)
    { 
        a=a+2;
        document.getElementById("news").style.fontSize = a + "px";
        document.getElementById("news").style.lineHeight = (a + 11) + "px";
    }
}
function sizetodecrease()
{
    if(a>13)
    {
        a=a-2;
        document.getElementById('news').style.fontSize = a + "px";
        document.getElementById("news").style.lineHeight = (a + 11) + "px";
    }
}

$(document).ready(function() {
    var currentPosition = 0;
    var slideWidth = 560;
    var slides = $('.slide');
    var numberOfSlides = slides.length;

    // Remove scrollbar in JS
    $('#slidesContainer').css('overflow', 'hidden');
    $('#leftControl').hide();
    $('#rightControl').hide();
    
    // Wrap all .slides with #slideInner div
    slides
    .wrapAll('<div id="slideInner"></div>')
    // Float left to display horizontally, readjust .slides width
	.css({
	    'float': 'left',
	    'width': slideWidth
	});

    // Set #slideInner width equal to total width of all slides
    $('#slideInner').css('width', slideWidth * numberOfSlides);

    // Hide left arrow control on first load
    manageControls(currentPosition);

    // Create event listeners for .controls clicks
    $('.control')
    .bind('click', function() {
        // Determine new position
        currentPosition = ($(this).attr('id') == 'rightControl') ? currentPosition + 1 : currentPosition - 1;

        // Hide / show controls
        manageControls(currentPosition);
        // Move slideInner using margin-left
        $('#slideInner').animate({
            'marginLeft': slideWidth * (-currentPosition)
        },2000);
    });

    // manageControls: Hides and Shows controls depending on currentPosition
    function manageControls(position) {
        // Hide left arrow if position is first slide
        if (position == 0) { $('#leftControl').hide() } else { $('#leftControl').show() }
        // Hide right arrow if position is last slide
        if (position == numberOfSlides - 1) { $('#rightControl').hide() } else { $('#rightControl').show() }
    }
});