function show_layer(lname)
{
    if(document.layers){ //NN4+
        document.layers[lname].visibility="show";
    }
    else if(document.getElementById){ //gecko(NN6) + IE 5+
        var obj = document.getElementById(lname);
        obj.style.display="block";
    }
    else if(document.all){ // IE 4
        document.all[lname].style.display="block";
    }
    else{
        lname.style.visibility="visible";
    } 
}

function hide_layer(lname)
{
    if(document.layers){ //NN4+
        document.layers[lname].visibility="hide";
    }
    else if(document.getElementById){ //gecko(NN6) + IE 5+
        var obj = document.getElementById(lname);
        obj.style.display="none";
    }
    else if(document.all){ // IE 4
        document.all[lname].style.display="none";
    }
    else{
        lname.style.visibility="hidden";
    }
}

function changeLayer(lname,formname)
{
    var fina;

    if( formname==''){
        eval("fina=document.forms[0]."+lname+"[0].checked");
    }
    else{
        eval("fina=document."+formname+"."+lname+"[0].checked");
    }

    if(fina){
        show_layer(lname+'div');
    }
    else{
        hide_layer(lname+'div');
    }
}