function show_header_category()
	{	
		var header_category_div = document.getElementById('header_category_div');
		header_category_div.style.display='';
		
		var product_list_link = document.getElementById('product_list_link');
		//alert('top='+product_list_link.offsetTop);
		//alert('left='+product_list_link.offsetLeft);
		//alert('height='+product_list_link.offsetHeight);
		//header_category_div.style.top = product_list_link.offsetTop + product_list_link.offsetHeight;
		//header_category_div.style.left = product_list_link.offsetLeft;
		//header_category_div.style.left = product_list_link.scrollTop;
		header_category_div.style.top = 148;
		header_category_div.style.left = 430;
	}
	function hidden_header_category()
	{	
		var header_category_div = document.getElementById('header_category_div');
		header_category_div.style.display='none';
	}