function checkBrowserSupport(){
    var browser=navigator.appName;
    var b_version=navigator.appVersion;
    var version=parseFloat(b_version);
    if ((browser=="Netscape" || browser=="Microsoft Internet Explorer") && (version<4)){
        var k=document.createElement('div'); 
        k.innerHTML="Öreg böngésző";
        //k.setAttribute('id','unsupported_browser_div');
        //k.setAttribute('name','unsupported_browser_div');
        k.setAttribute('class','unsupported_browser_div');
        k.className='unsupported_browser_div';
        document.body.appendChild(k);
        
    }
}