var blocks = new Array();

function show_block(id)
{
	if(blocks[id]==undefined || blocks[id]==0)
	{
		blocks[id] = 1;
		document.getElementById('img_' + id).src="/img/images/minus.png";
		document.getElementById('block_' + id).style.display="block";
	}
	else
	{
		blocks[id] = 0;
		document.getElementById('img_' + id).src="/img/images/plus.png";
		document.getElementById('block_' + id).style.display="none";
	}
}