content=0; // From another part of the script

function ajaxload(type,value,callback) {
    if (content==0) {
        url = '/ajax.php?'+type+'='+value;
    } else {
        url = '/ajax.php?'+type+'='+value+'&content';
    }
    var opt = {
        onSuccess: function(t) { callback(t) }
    }
    new Ajax.Request(url, opt);
}