//here you place the ids of every element you want.
var ids=new Array('D14012010','D07012010','D17122009','D14122009','D10122009','D08122009','D03122009','D12112009','D10112009','D06112009','D03112009','D31102009','D30102009','D25102009','D21102009','D17102009','D15102009','D09102009','D30902009','D25012010','D27012010','D02032010','D09032010','D16032010','D18032010','D23032010');

function switchid(id){  
    hideallids();
    showdiv(id);
}

function hideallids(){
    //loop through the array and hide each element by id
    for (var i=0;i<ids.length;i++){
        hidediv(ids[i]);
    }         
}

function hidediv(id) {
    //safe function to hide an element with a specified id
    if (document.getElementById) { // DOM3 = IE5, NS6
        document.getElementById(id).style.display = 'none';
    }
    else {
        if (document.layers) { // Netscape 4
            document.id.display = 'none';
        }
        else { // IE 4
            document.all.id.style.display = 'none';
        }
    }
}

function showdiv(id) {
    //safe function to show an element with a specified id
          
    if (document.getElementById) { // DOM3 = IE5, NS6
        document.getElementById(id).style.display = 'block';
    }
    else {
        if (document.layers) { // Netscape 4
            document.id.display = 'block';
        }
        else { // IE 4
            document.all.id.style.display = 'block';
        }
    }
}