function change_image(number)
{
	if(document.all)
	{
		document.all.big_image.src = big_images[number];
		document.all.top_image.src = top_images[number];
		document.all.bottom_image.src = bottom_images[number];
		for(var i=1; i<numbers.length;  i++)
		{
			element_id = 'number_' + i;
			obj = document.getElementById(element_id);
			if(number==i)
			{
				obj.className = 'imgActive';
				obj.style.cursor = 'auto';
			}
			else
			{
				obj.className = 'imgDeactive';
				obj.style.cursor = 'pointer';
			}
		}
	}
	else
	{
		document.big_image.src = big_images[number];
		document.top_image.src = top_images[number];
		document.bottom_image.src = bottom_images[number];
		for(var i=1; i<numbers.length;  i++)
		{
			element_id = 'number_' + i;
			obj = document.getElementById(element_id);
			if(number==i)
			{
				obj.className = 'imgActive';
				obj.style.cursor = 'auto';
			}
			else
			{
				obj.className = 'imgDeactive';
				obj.style.cursor = 'pointer';
			}
		}
	}
}

var index = 1;

function back_foto()
{
	if(index>1)
	{
		number = index - 1;
		index = number;
		if(document.all)
		{
			document.all.big_image.src = big_images[number];
			document.all.top_image.src = top_images[number];
			document.all.bottom_image.src = bottom_images[number];
		}
		else
		{
			document.big_image.src = big_images[number];
			document.top_image.src = top_images[number];
			document.bottom_image.src = bottom_images[number];
		}		


	}
}

function forward_foto()
{
	if((index+1)<numbers.length)
	{
		number = index + 1;
		index = number;
		if(document.all)
		{
			document.all.big_image.src = big_images[number];
			document.all.top_image.src = top_images[number];
			document.all.bottom_image.src = bottom_images[number];
		}
		else
		{
			document.big_image.src = big_images[number];
			document.top_image.src = top_images[number];
			document.bottom_image.src = bottom_images[number];
		}		
		

	
	}
}