function setvisibility(i, j) {
    var count;

    // Hidden all divs
    for (count = 0; count < i; count++) {
        if ((count != j) ) {
            document.getElementById('div'+count).style.visibility = 'hidden';
            document.getElementById('div'+count).style.position = 'absolute';
        }
    }
    
    // Show selected div
    if (document.getElementById('div' + j).style.visibility != 'visible') {
        document.getElementById('div' + j).style.position = 'relative';
        document.getElementById('div' + j).style.visibility = 'visible';
    }
}