var isDHTML=0;
		var isID=0;
		var isAll=0;
		var isLayers=0;

		var plus_image = new Image();
		var minus_image = new Image();

		plus_image.src = "images/plus.gif";
		minus_image.src = "images/minus.gif";

		if (navigator.userAgent.indexOf("Opera") != -1) {
		document.write('<link rel="stylesheet" type="text/css" href="style_opera.css">');
		}
						
		if (document.getElementById) {isID = 1; isDHTML = 1;}
		else
		{
			if (document.all) {isAll = 1; isDHTML = 1;}
			else {browserVersion=parseInt(navigator.appVersion);
			      if ((navigator.appName.indexOf('Netscape') != -1) && (browserVersion==4)) {isLayers=1; isDHTML=1;}}
		}

		function toggleIt(name) {
			if (isID) {	var x = document.getElementById(name).style; }
			else 
			{ if (isAll) { var x = document.all[name].style; } 
				else
				{ if (isLayers) { var x = document.layers[name].style ; }
				}
			}

			if (x.display == 'block') {
				x.display = 'none';
				document.images[name + '_img'].src = 'i/plus.gif';
			} else {
				x.display = 'block';
				document.images[name + '_img'].src = 'i/minus.gif';
			}
		}