//  basic event handling

var dw_Event = {
  
    add: function(obj, etype, fp, cap) {
        cap = cap || false;
        if (obj.addEventListener) obj.addEventListener(etype, fp, cap);
        else if (obj.attachEvent) obj.attachEvent("on" + etype, fp);
    }, 

    remove: function(obj, etype, fp, cap) {
        cap = cap || false;
        if (obj.removeEventListener) obj.removeEventListener(etype, fp, cap);
        else if (obj.detachEvent) obj.detachEvent("on" + etype, fp);
    }, 
    
    DOMit: function(e) { 
        e = e? e: window.event;
        if (!e.target) e.target = e.srcElement;
        if (e.target.nodeType == 3) e.target = e.target.parentNode;
        if (!e.preventDefault) e.preventDefault = function () { e.returnValue = false; return false; }
        if (!e.stopPropagation) e.stopPropagation = function () { e.cancelBubble = true; }
        return e;
    }
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {  
    //window.onload = func;
    window.onload = function() { func(); }
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }  
}