var tab = new Array();
var current = new Array();

function change_foto(dif,name,obj, katalog){
	var foto = document.getElementById('obraz' + dif);
    var big = document.getElementById('current' + dif);
       
    foto.src='wykresy/'+katalog+'/'+name+'.gif';
    big.innerHTML=obj.innerHTML;
}
    
function hide_foto(dif){
    if( !current[dif] ) current[dif] = 0;
    if(!tab[dif][current[dif]+3]){
        var next = document.getElementById('next' + dif);
            next.style.display='none';
    }else{
        var next = document.getElementById('next' + dif);
        next.style.display='inline';
    }
    if(!tab[dif][current[dif]-1]){
        var prev = document.getElementById('prev' + dif);
        prev.style.display='none';
    }else{
        var prev = document.getElementById('prev' + dif);
        prev.style.display='inline';
    } 
}

function next_foto(dif){
    if( !current[dif] ) current[dif] = 0;
    if(tab[dif][current[dif]+3]){
		var not1 = document.getElementById('not1' + dif);
		var not2 = document.getElementById('not2' + dif);
		var not3 = document.getElementById('not3' + dif);
		not1.innerHTML=tab[dif][current[dif]+1];
		not2.innerHTML=tab[dif][current[dif]+2];
		not3.innerHTML=tab[dif][current[dif]+3];
		current[dif]=current[dif]+1;
	}
	hide_foto(dif);
}

function prev_foto(dif){
    if( !current[dif] ) current[dif] = 0;
	if(tab[dif][current[dif]-1]){
		var not1 = document.getElementById('not1' + dif);
		var not2 = document.getElementById('not2' + dif);
		var not3 = document.getElementById('not3' + dif);
		not1.innerHTML=tab[dif][current[dif]-1];
		not2.innerHTML=tab[dif][current[dif]];
		not3.innerHTML=tab[dif][current[dif]+1]
		current[dif]=current[dif]-1;
	}
	hide_foto(dif);
}