function toggle(elementID,imgName)
{
	if (document.images)
	{
		imgClosed = new Image(12,15);
		imgClosed.src ="images/minus.gif";
		imgOpen = new Image(12,15);
		imgOpen.src="images/plus.gif";
		//alert(document.images[imgName].src );	
		//alert(imgClosed.src);
		document.images[imgName].src == imgClosed.src ? document.images[imgName].src = imgOpen.src : document.images[imgName].src = imgClosed.src;
	}

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