var app = navigator.appName.toLowerCase();
var ver = navigator.appVersion.toLowerCase();
ver = parseInt(ver.substring(0,1));
var ie4 = (app.indexOf("microsoft") != -1 && ver >= 4);
var nn3 = (app.indexOf("netscape") != -1 && ver == 3);
var nn4 = (app.indexOf("netscape") != -1 && ver >= 4);
var scriptAllow = (ie4 || nn3 || nn4);

function hover(name,imgname,mover) 
{
	var baseurl = "img/";

	if (scriptAllow) 
	{
		tar = "";
		if (mover) {
			tar = baseurl + imgname + "1.gif";
		} else {
			tar = baseurl + imgname + ".gif";
		}

		if (tar != "")
			eval("document.all." + name + ".src = tar;");
	}
}