var pos = 0;
var minus = -1;
var one = 60;
var slideW = 420;
var moveTo = slideW/one;
var speed = 1500;
var blocks = ".some_one";
var parent = ".slide";

function gotoright(){
	kol = $(blocks).length;
	l = kol * one;
	ost = kol%moveTo;
	ost *= one;
	small_ost = ost;
	big_ost = l - ost;
	big_ost -= slideW;
	small_ost *= minus;
	big_ost *= minus;
	right_stop = l - slideW;
	right_stop *= minus; 
	if(pos != big_ost && pos != right_stop){
		pos -= slideW;
		$(parent).animate({left:pos}, speed);
	}
	else if(pos != right_stop){
		pos += small_ost;
			$(parent).animate({left:pos}, speed);
	}
}
	// this function move slider to the left side
function gotoleft(){
	kol = $(blocks).length;
	l = kol * one;
	ost = kol%moveTo;
	ost *= one;
	small_ost = ost;
	big_ost = l - ost;
	big_ost -= slideW;
	small_ost *= minus;
	big_ost *= minus;
	if(pos != small_ost && pos != 0){
		pos += slideW;
			$(parent).animate({left:pos}, speed);
	}
	else if(pos != 0){
		pos -= small_ost;
			$(parent).animate({left:pos}, speed);
	}
}

function act(obj){
	src = $(obj).attr('src');
	$('.phot_prev').attr('src', '/img'+src);
	$('.some_one > div > img').removeAttr('class');
	$(obj).addClass('act');
}