isGoodBrowser = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 3) || ((navigator.appName.indexOf("Explorer") > -1) && parseInt(navigator.appVersion) >= 4);
c_on='';
if (isGoodBrowser){
        iar=new Array();
        c_im=new Image();

        iar['i5']= new Image(); iar['i5'].src = "img/menu/about2.gif";
        iar['i1']= new Image(); iar['i1'].src = "img/menu/uslug2.gif";
        iar['i2']= new Image(); iar['i2'].src = "img/menu/for_rek2.gif";
        iar['i3']= new Image(); iar['i3'].src = "img/menu/clients2.gif";
        iar['i4']= new Image(); iar['i4'].src = "img/menu/contacs2.gif";
		
		
}

function ion(img_name){
        if (isGoodBrowser){
                c_im.src=document.images[img_name].src;
                document.images[img_name].src=iar[img_name].src;
                c_on=img_name;
        }
}
function ion2(img_name2){
        if (isGoodBrowser){
				copy0=document.images['i0'].src;
                document.images['i0'].src=iar[img_name2].src;
         }
}
function ioff() {
        if (isGoodBrowser && c_on.length>0){
                document.images[c_on].src=c_im.src;
        }
}
function ioff2() {
        if (isGoodBrowser && c_on.length>0){
                document.images['i0'].src=copy0;
        }
}