//GLOBALS
var w3c = (document.getElementById) ? 1:0
var ns4 = (document.layers) ? 1:0  //browser detect for NS4 & W3C standards





function visual(aa,num_cat) {
if (document.getElementById){

    if(document.getElementById(aa).style.visibility=='hidden'){
        document.getElementById(aa).style.visibility='visible';
    }else{
        for (i=1;i<=num_cat;i++){
           document.getElementById(i).style.visibility='hidden';
        }
        document.getElementById(aa).style.visibility='hidden';
    }
}
}


function visual_cat(cat,num_cat) {
if (document.getElementById){

    //alert('cat='+cat+',num_cat='+num_cat+',top='+top);

    for (i=1;i<=num_cat;i++){
        if(i!=cat)
           document.getElementById(i).style.visibility='hidden';


    }
    //alert('cat='+cat+',display='+document.getElementById(cat).style.display+',top='+top);
    if(document.getElementById(cat).style.visibility=='hidden'){
        document.getElementById(cat).style.visibility='visible';
    }else{
        document.getElementById(cat).style.visibility='hidden';
    }
}
}