var agt=navigator.userAgent.toLowerCase();
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_opera = (agt.indexOf("opera") != -1);
var is_gecko = (agt.indexOf('gecko') != -1);

//IE 6 Menu
gvHover = function() {     
    var gvME = document.getElementById("GVMenu").getElementsByTagName("li");     
    for (var i=0; i<gvME.length; i++) {         
        gvME[i].onmouseover=function() {this.className+=" over";}         
        gvME[i].onmouseout=function() {this.className=this.className.replace(new RegExp(" over\\b"), "");}     
    } 
} 

document.write("<!--[if lte IE 6]><style type=\"text/css\">#GVMenu ul li a:link, #NSMenu ul li a:visited{width:16em;} #GVMenu li:hover iframe, #GVMenu li.over iframe{display:block;width:16em;height:65px;}</style><![endif]-->");

if(window.attachEvent) window.attachEvent("onload", gvHover);