function showhide(layer_ref) { 
        if (document.all) { //IS IE 4 or 5 (or 6 beta) 
            eval( "state=document.all." + layer_ref + ".style.display"); 
            if (state == 'block') { 
                state = 'none'; 
            } 
            else { 
                state = 'block'; 
            } 
            eval( "document.all." + layer_ref + ".style.display = state"); 
        } 
        if (document.layers) { //IS NETSCAPE 4 or below 
        state = document.layers[layer_ref].display = state; 
            if (state == 'block') { 
                state = 'none'; 
            } 
            else { 
                state = 'block'; 
            } 
        document.layers[layer_ref].display = state; 
        } 
        if (document.getElementById &&!document.all) { 
        hza = document.getElementById(layer_ref); 
        state = hza.style.display;
            if (state == 'block') { 
                state = 'none'; 
            } 
            else { 
                state = 'block'; 
            } 
        hza.style.display = state; 
        } 
        } 
     
      function setLayerStatus(layer_ref, status) { 
        if (document.all) { //IS IE 4 or 5 (or 6 beta) 
            eval( "document.all." + layer_ref + ".style.display = " + status); 
        } 
        if (document.layers) { //IS NETSCAPE 4 or below 
            document.layers[layer_ref].display = status; 
        } 
        if (document.getElementById &&!document.all) { 
            document.getElementById(layer_ref).style.display = status; 
        } 
       }
       
       function hideDiv(layer_ref) {
           if (document.all) { //IS IE 4 or 5 (or 6 beta) 
                eval( "document.all." + layer_ref + ".style.display = 'none'"); 
            } 
            if (document.layers) { //IS NETSCAPE 4 or below 
                document.layers[layer_ref].display = 'none'; 
            } 
            if (document.getElementById &&!document.all) { 
                hza = document.getElementById(layer_ref); 
                state = hza.style.display;
                hza.style.display = 'none'; 
            } 
       } 
       
       function showDiv(layer_ref) {
           if (document.all) { //IS IE 4 or 5 (or 6 beta) 
                eval( "document.all." + layer_ref + ".style.display = 'block'"); 
            } 
            if (document.layers) { //IS NETSCAPE 4 or below 
                document.layers[layer_ref].display = 'block'; 
            } 
            if (document.getElementById &&!document.all) { 
                hza = document.getElementById(layer_ref); 
                state = hza.style.display;
                hza.style.display = 'block'; 
            } 
       }