v3 = 0; op = 0; ie4  = 0; ie5 = 0; nn4 = 0; nn6 = 0; isMac = 0; aol = 0;
if(document.images){
    if(navigator.userAgent.indexOf("Opera") != -1){
        op = 1;
    } else {
        if(navigator.userAgent.indexOf("AOL") != -1){
            aol = 1;
        } else {
            ie4 = (document.all && !document.getElementById);
            nn4 = (document.layers);
            ie5 = (document.all && document.getElementById);
            nn6 = (document.addEventListener);
        }
    }
} else {
    v3 = 1;	
}
if(navigator.userAgent.indexOf("Mac") != -1){
    isMac = 1;
}
if(op){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
} 
if(ie4){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
} 
if(ie5){
    void(0);
} 
if(nn4){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
} 
if(nn6){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
} 
if(aol){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
}
if(v3){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
}
if(isMac){
    alert("You are using a non-optimal browser.\nThis site is best viewed with Internet Explorer v.5.5 or later.\nYou may experience some prolems...");
}