function scroll_up() {
    
    var d = document.getElementById('blks-inner');
    var Npages = parseInt(d.offsetHeight / ScrollN);
    
    if(Npages < 1) {
    	Npages = 1;
    } 
	

	if (Npages - Scroll > spp) {
		Scroll = Scroll + 1;
		d.style.top = "-" + parseInt(Scroll * ScrollN) + "px";
	}
	
//	alert('Npages = ' + Npages + ', Scroll = ' + Scroll + ', spp = ' + spp);
	
	if (Npages - Scroll <= spp) {
		
		//document.getElementById('scroll_up').style.backgroundPosition='0 -21';
		document.getElementById('scroll_up').style.backgroundImage = 'url("/img/Down-Grey.png")';
		document.getElementById('scroll_up').style.cursor = 'default';
	}
	 
	if (Scroll > 0) {
		//document.getElementById('scroll_down').style.backgroundPosition='0 0';
		document.getElementById('scroll_down').style.backgroundImage = 'url("/img/Up-Orange.png")'
		document.getElementById('scroll_down').style.cursor = 'pointer';
	}
	
	return false;
}

function scroll_dn() {
    
    var d = document.getElementById('blks-inner');
    var Npages = parseInt(d.offsetHeight / ScrollN); 
    
    if(Npages < 1) {
		Npages = 1;
	}
    
    Scroll = Scroll - 1;
    
    if (Scroll >= 0) {
		d.style.top = "-" + parseInt(Scroll * ScrollN) + "px";
    } else {
		Scroll = 0;
    }
	
	// Если количество скриншотов больше ...
	if (Scroll > 0) {
		
		document.getElementById('scroll_up').style.backgroundImage = 'url("/img/Down-Orange.png")';
		document.getElementById('scroll_up').style.cursor = 'pointer';
	}
	else {
		document.getElementById('scroll_down').style.backgroundImage = 'url("/img/Up-Grey.png")';
		document.getElementById('scroll_down').style.cursor = 'default';
	}
    
    
    return false;
}

Scroll_s  = 0;
ScrollN_s = 110;
Spp_s	  = 3;

function scroll_left() {
	var d = document.getElementById('inner_series');
    var Npages = parseInt(d.offsetWidth / ScrollN_s);

}



function checkScreenshotsStart() {
	var d = document.getElementById('blks-inner');
    var Npages = parseInt(d.offsetHeight / ScrollN);
	
//	alert('Npages = ' + Npages + ', spp = ' + spp + ', Scroll = ' + Scroll);
	
    if (Npages - spp <= Scroll) { 
    	document.getElementById('scroll_up').style.backgroundImage = 'url("/img/Down-Grey.png")';
	}
	else {
		document.getElementById('scroll_up').style.backgroundImage = 'url("/img/Down-Orange.png")';
		document.getElementById('scroll_up').style.cursor = 'pointer';
	}
}