function changeimage_inc(id,limit,image_name)
	{
		var image_index;
		var image_src;
		image_index=document.getElementById(id).name;
		image_index=image_index*1+1;
		if(image_index>limit)
		{
			image_index=1;
		}
		document.getElementById(id).name=image_index;
		image_src="images/"+image_name+image_index+".gif";
		document.getElementById(id).src=image_src;
	}
	
	function changeimage_dec(id,limit,image_name)
	{
		var image_index;
		var image_src;
		image_index=document.getElementById(id).name;
		image_index=image_index*1-1;
		if(image_index<=0)
		{
			image_index=limit;
		}
		document.getElementById(id).name=image_index;
		image_src="images/"+image_name+image_index+".gif";
		document.getElementById(id).src=image_src;
	}