function tab_ch(tab){
	//ilość zakładek:
	//zak=2;
	 for(i=1; i<=zak; i++){
	  document.getElementById('tab'+i).className="tab_off";
	  document.getElementById('tab_links_'+i).style.visibility='hidden';
	 }
	  document.getElementById('tab'+tab).className="tab_on";
	  document.getElementById('tab_links_'+tab).style.visibility='visible';
	}
function testprev(id,tablica){

	document.getElementById('gallery_link_a').href="/gallery/"+id;
	if(id<1){
		document.getElementById('gallery_prev').innerHTML=0;
		document.getElementById('gallery_next').innerHTML=1;
		document.getElementById('gallery_link_a').href="/gallery/"+tablica[0][0];
		document.getElementById('img_gallery').src=tablica[1][0];
		}
	else{
		document.getElementById('gallery_prev').innerHTML=parseInt(id)-1;
		document.getElementById('gallery_next').innerHTML=parseInt(id)+1;
		document.getElementById('gallery_link_a').href="/gallery/"+tablica[0][id];
		document.getElementById('img_gallery').src=tablica[1][id];
		}
	}
function testnext(id, tablica){
	document.getElementById('gallery_link_a').href="/gallery/"+id;
	if(tablica[0].length<=id){
		document.getElementById('gallery_prev').innerHTML=0;
		document.getElementById('gallery_next').innerHTML=1;
		document.getElementById('gallery_link_a').href="/gallery/"+tablica[0][0];
		document.getElementById('img_gallery').src=tablica[1][0];
		}
	else{
		document.getElementById('gallery_prev').innerHTML=parseInt(id)-1;
		document.getElementById('gallery_next').innerHTML=parseInt(id)+1;
		document.getElementById('gallery_link_a').href="/gallery/"+tablica[0][id];
		document.getElementById('img_gallery').src=tablica[1][id];
		}
	}