function switchContent(toSelect) {
    
    for (var i=1; i <= 4; i++) {
    
        var contentElement = document.getElementById("content" + i);
        var buttonElement = document.getElementById("button" + i);
        var selectorElement = document.getElementById("selected" + i);
        
        if (toSelect == i) {
        
            contentElement.style.display = "block";
            selectorElement.style.display = "inline";
            buttonElement.className = "selected";
        }
        else {
            
            contentElement.style.display = "none";
            selectorElement.style.display = "none";
            buttonElement.className = "notSelected";
        }
    }
}