var obj_last = 0;
	
function change_image(img)
{
	var img_name = 'img_'+img;
	var obj_img_center = document.getElementById('img_center');
	obj_img_center.src = img_arr[img];
	
	var obj = document.getElementById(img_name);
	obj.className = 'over';
			
	if(document.getElementById('img_'+obj_last)&&obj_last!=img)
	{		
		//alert('ss');
		document.getElementById('img_'+obj_last).className='';
	}
	obj_last=parseInt(img);
}

function set_image(status)
{
	if(status=='back')
	{
		if(obj_last-1<0) //jei pirmas
		{
			change_image(img_arr.length-1);
		} else
		{
			change_image(obj_last-1);			
		}		
	} else
	{
		if(obj_last==img_arr.length-1) //jei paskutinis
		{
			change_image(0);
		} else
		{			
			change_image(obj_last+1);
		}
	}
}

function change_style(id,status)
{	
	//alert(status);
	if(status)
	{		
		document.getElementById(id).className='image_bg';
	} else
	{
		document.getElementById(id).className='';
	}
}