/**
 * DOMready
 */

Object.extend(Event, {
  _domReady : function() {
    if (arguments.callee.done) return;
    arguments.callee.done = true;

    if (Event._timer)  clearInterval(Event._timer);
    
    Event._readyCallbacks.each(function(f) { f() });
    Event._readyCallbacks = null;
    
  },
  onReady : function(f) {
    if (!this._readyCallbacks) {
      var domReady = this._domReady;
      
      if (domReady.done) return f();
      
      if (document.addEventListener)
        document.addEventListener("DOMContentLoaded", domReady, false);
        
        /*@cc_on @*/
        /*@if (@_win32)
            var dummy = location.protocol == "https:" ?  "https://javascript:void(0)" : "javascript:void(0)";
            document.write("<script id=__ie_onload defer src='" + dummy + "'><\/script>");
            document.getElementById("__ie_onload").onreadystatechange = function() {
                if (this.readyState == "complete") { domReady(); }
            };
        /*@end @*/
        
        if (/WebKit/i.test(navigator.userAgent)) { 
          this._timer = setInterval(function() {
            if (/loaded|complete/.test(document.readyState)) domReady(); 
          }, 10);
        }
        
        Event.observe(window, 'load', domReady);
        Event._readyCallbacks =  [];
    }
    Event._readyCallbacks.push(f);
  }
});




/**
 * rollover img
 */

overImgClassName = 'btn';
overImgPostfix = '_on';

function RN_preloadImages() {
	var btns = $A(document.getElementsByClassName(overImgClassName));
	btns.each(function (node){
		node.imgsrc = node.src;
		node.imgsrc_over = node.src.replace('.gif', overImgPostfix+'.gif').replace('.jpg', overImgPostfix+'.jpg');
		node.onmouseover = function() { this.src = this.imgsrc_over; };
		node.onmouseout = function() { this.src = this.imgsrc; };
	});
}




/**
 * initialize
 */

function init(){
	RN_preloadImages();
}


Event.onReady(init);