browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
        if (browserName == "Microsoft Internet Explorer" && browserVer >= 3) version = "n3";
        else version = "n2";
        if (browserName == "Netscape" && browserVer >= 3) version = "n3";

        if (version == "n3") {
       	introduction_on = new Image();
    	   introduction_on.src = "images/i_introduction_on.gif";
			happening_on = new Image();
      	happening_on.src = "images/i_happening_on.gif";
			catalog_on = new Image();
         catalog_on.src = "images/i_catalog_on.gif";
		   terms_on = new Image();
         terms_on.src = "images/i_terms_on.gif";
		   contact_on = new Image();
         contact_on.src = "images/i_contact_on.gif";
		 cart_on = new Image();
         cart_on.src = "images/button-cart-on.gif";
				                        
        introduction_off = new Image();
        introduction_off.src = "images/i_introduction_off.gif";
		  happening_off = new Image();
        happening_off.src = "images/i_happening_off.gif";
		  catalog_off = new Image();
        catalog_off.src = "images/i_catalog_off.gif";
		  terms_off = new Image();
        terms_off.src = "images/i_terms_off.gif";
	     contact_off = new Image();
        contact_off.src = "images/i_contact_off.gif";
		cart_off = new Image();
        cart_off.src = "images/button-cart-off.gif";
		}

function ON(imgName) {
        if (version == "n3") {
        imgOn = eval(imgName + "on.src");
        document [imgName].src = imgOn;
        }
}
function OFF(imgName) {
        if (version == "n3") {
        imgOff = eval(imgName + "off.src");
        document [imgName].src = imgOff;
        }
}