//***** Checking Browser *****

function chkBrowser() {
    if ((navigator.userAgent.indexOf('Opera/6.') !== -1) || (navigator.userAgent.indexOf('Opera 6.') !== -1)) {
        return(0);
        }
    if (document.all || document.getElementById) { return(1) }
    return(0);
        }

//***** Hiding the block if chkBrowser is true *****

if (chkBrowser()) {
    document.write(
        '<style type="text/css">'+
        '.showhide {'+
        '    display: none;'+
        '    }'+
        '</style>'
        );
    }

//***** Changing the Block style *****

function chBlock(id) {
    if (chkBrowser() == 0) { return; }

    if (document.all) {
        if (document.all[id].style.display != 'block') {
            document.all[id].style.display = 'block';
            }
        else {
            document.all[id].style.display = 'none';
            }
        return;
        }

    if (document.getElementById(id).style.display != 'block') {
        document.getElementById(id).style.display = 'block';
        }
    else {
        document.getElementById(id).style.display = 'none';
        }
    return;
    }