var is_netscape = (navigator.appName == 'Netscape') ? true : false;


function go_url(url){
    if(url != ''){
        window.location = url;
    }
    return;
}

function allowVal_PhoneNumber(input, event){
    var key_code = (is_netscape) ? event.which : event.keyCode;
    if 
        (
            (key_code == 0) ||   // delete, arrows, other...
            (key_code == 8) ||   // backspace
            (key_code == 43) || // plus
            ((key_code >= 48) && (key_code <= 57)) // numbers 0..9
        )
    {
        return true;
    }   
    if (!is_netscape)
        event.returnValue = false;
    return false;
    
}

function do_not_allow_symbols(input, event){
    var key_code = (is_netscape) ? event.which : event.keyCode;
    if 
        (
            ((key_code >= 48) && (key_code <= 57)) // numbers 0..9
        )
    {
        return false;
    }   
    if (!is_netscape){
        event.returnValue = true;
    }
    return true;
    
}