var imageplus = new Image(); imageplus.src = "/images/plus.gif";
var imageminus = new Image(); imageminus.src = "/images/minus.gif";

function plus_click(number)
{
	blocking(number);
	//change_image('image'+number);
}

function blocking(nr)
{
	if (document.layers)
	{
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = current;
	}
	else if (document.all)
	{
		current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = current;
	}
	else if (document.getElementById)
	{
	
		vista = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = vista;
	}
}

function change_image(image){
	
	if(document.images[image].src.indexOf("/images/plus.gif") >= 0){
		document.images[image].src="/images/minus.gif";
	}else{
		document.images[image].src="/images/plus.gif";
	}
}