// JavaScript Document
/*
	add(elem, type, handle)
		добавить обработчик handle для события type на элементе elem
		
	remove(elem, type, handle)
		убрать обработчик события 
*/

Event = (function() {
	 
	  var guid = 0
	     
	  function fixEvent(event) {
	    event = event || window.event
	   
	    if ( event.isFixed ) {
	      return event
	    }
	    event.isFixed = true
	   
	    event.preventDefault = event.preventDefault || function(){this.returnValue = false}
	    event.stopPropagation = event.stopPropagaton || function(){this.cancelBubble = true}
	     
	    if (!event.target) {
	        event.target = event.srcElement
	    }
	   
	    if (!event.relatedTarget && event.fromElement) {
	        event.relatedTarget = event.fromElement == event.target ? event.toElement : event.fromElement;
	    }
	   
	    if ( event.pageX == null && event.clientX != null ) {
	        var html = document.documentElement, body = document.body;
	        event.pageX = event.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) - (html.clientLeft || 0);
	        event.pageY = event.clientY + (html && html.scrollTop || body && body.scrollTop || 0) - (html.clientTop || 0);
	    }
	   
	    if ( !event.which && event.button ) {
	        event.which = (event.button & 1 ? 1 : ( event.button & 2 ? 3 : ( event.button & 4 ? 2 : 0 ) ));
	    }
	     
	    return event
	  } 
	   
	  /* Вызывается в контексте элемента всегда this = element */
	  function commonHandle(event) {
	    event = fixEvent(event)
	     
	    var handlers = this.events[event.type]
	 
	    for ( var g in handlers ) {
	      var handler = handlers[g]
	 
	      var ret = handler.call(this, event)
	      if ( ret === false ) {
	          event.preventDefault()
	          event.stopPropagation()
	      }
	    }
	  }
	   
	  return {
	    add: function(elem, type, handler) {
	      if (elem.setInterval && ( elem != window && !elem.frameElement ) ) {
	        elem = window;
	      }
	       
	      if (!handler.guid) {
	        handler.guid = ++guid
	      }
	       
	      if (!elem.events) {
	        elem.events = {}
	        elem.handle = function(event) {
	          if (typeof Event !== "undefined") {
	            return commonHandle.call(elem, event)
	          }
	        }
	      }
	       
	      if (!elem.events[type]) {
	        elem.events[type] = {}       
	       
	        if (elem.addEventListener)
	          elem.addEventListener(type, elem.handle, false)
	        else if (elem.attachEvent)
	          elem.attachEvent("on" + type, elem.handle)
	      }
	       
	      elem.events[type][handler.guid] = handler
	    },
	     
	    remove: function(elem, type, handler) {
	      var handlers = elem.events && elem.events[type]
	       
	      if (!handlers) return
	       
	      delete handlers[handler.guid]
	       
	      for(var any in handlers) return
	      if (elem.removeEventListener)
	        elem.removeEventListener(type, elem.handle, false)
	      else if (elem.detachEvent)
	        elem.detachEvent("on" + type, elem.handle)
	         
	      delete elem.events[type]
	     
	       
	      for (var any in elem.events) return
	      try {
	        delete elem.handle
	        delete elem.events
	      } catch(e) { // IE
	        elem.removeAttribute("handle")
	        elem.removeAttribute("events")
	      }
	    }
	  }
	}())