var currentSlide = 0;

var slides = [];
slides[slides.length] = "/presentation/010.gif";
slides[slides.length] = "/presentation/020.gif";
slides[slides.length] = "/presentation/030.gif";
slides[slides.length] = "/presentation/040.gif";
slides[slides.length] = "/presentation/050.gif";
slides[slides.length] = "/presentation/060.gif";
slides[slides.length] = "/presentation/070.gif";
slides[slides.length] = "/presentation/080.gif";
slides[slides.length] = "/presentation/090.gif";
slides[slides.length] = "/presentation/100.gif";
slides[slides.length] = "/presentation/110.gif";
slides[slides.length] = "/presentation/120.gif";
slides[slides.length] = "/presentation/130.gif";
slides[slides.length] = "/presentation/140.gif";
slides[slides.length] = "/presentation/150.gif";
slides[slides.length] = "/presentation/160.gif";
slides[slides.length] = "/presentation/180.gif";
slides[slides.length] = "/presentation/190.gif";
slides[slides.length] = "/presentation/200.gif";
slides[slides.length] = "/presentation/210.gif";
slides[slides.length] = "/presentation/220.gif";
slides[slides.length] = "/presentation/230.gif";

function showSlide(step) {

	currentSlide = currentSlide + step; 

	// Устанавливаем стрелки-переключатели
	if( currentSlide >= (slides.length - 1) ) {

		document.getElementById('arrow-right').src = '/presentation/arrow-right-passive.gif';
		document.getElementById('arrow-left').src = '/presentation/arrow-left-active.gif';
		currentSlide = slides.length - 1;
		
	} else { 
	
		if( currentSlide <= 0 ) {

			document.getElementById('arrow-right').src = '/presentation/arrow-right-active.gif';
			document.getElementById('arrow-left').src = '/presentation/arrow-left-passive.gif';
			currentSlide = 0;
		
		} else {
		
			document.getElementById('arrow-right').src = '/presentation/arrow-right-active.gif';
			document.getElementById('arrow-left').src = '/presentation/arrow-left-active.gif';
			
		}
		
	}
	
	document.getElementById('slide').src = slides[currentSlide];
	
	drawProgress();
	
}



function showThisSlide(position) {

	currentSlide = position; 

	// Устанавливаем стрелки-переключатели
	if( currentSlide >= (slides.length - 1) ) {

		document.getElementById('arrow-right').src = '/presentation/arrow-right-passive.gif';
		document.getElementById('arrow-left').src = '/presentation/arrow-left-active.gif';
		currentSlide = slides.length - 1;
		
	} else { 
	
		if( currentSlide <= 0 ) {

			document.getElementById('arrow-right').src = '/presentation/arrow-right-active.gif';
			document.getElementById('arrow-left').src = '/presentation/arrow-left-passive.gif';
			currentSlide = 0;
		
		} else {
		
			document.getElementById('arrow-right').src = '/presentation/arrow-right-active.gif';
			document.getElementById('arrow-left').src = '/presentation/arrow-left-active.gif';
			
		}
		
	}
	
	document.getElementById('slide').src = slides[currentSlide];
	
	drawProgress();
	
}




function drawProgress() {
	
	var progress = document.getElementById('progress');
	
	progress.innerHTML = '';
	
	for( var i = 0; i < slides.length; i++ ) {
	
		if( i == currentSlide ) {
		
			progress.innerHTML += '<img src="/presentation/progress-active.gif" alt="">';
		
		} else {
		
			progress.innerHTML += '<img src="/presentation/progress-passive.gif" alt="" class="pseudolink" onclick="showThisSlide(' + i + ')">';
		
		}
	
	}
	
}


function presentationPreload() {

	var preload = document.getElementById('presentation-preload');

	for( var i = 0; i < slides.length; i++ ) {
	
		preload.innerHTML += '<img src="' + slides[i] + '" alt="">';
	
	}
	
}