// addEvent() taken from
// http://www.dustindiaz.com/rock-solid-addevent/
function addEvent( obj, type, fn ) {
  //alert('adding ' + type + ' to ' + obj.id );
  if (obj.addEventListener) {
    obj.addEventListener( type, fn, false );
    EventCache.add(obj, type, fn);
  }
  else if (obj.attachEvent) {
    obj["e"+type+fn] = fn;
    obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
    obj.attachEvent( "on"+type, obj[type+fn] );
    EventCache.add(obj, type, fn);
  }
  else {
    obj["on"+type] = obj["e"+type+fn];
  }
}

function rmEvent( obj, type, fn ) {
  if(obj.removeEventListener) {
    obj.removeEventListener(type, fn, null);
  }
  if(obj.detachEvent) {
    obj.detachEvent(type, fn);
  }
}

var EventCache = function() {
  var listEvents = [];
  return {
    listEvents : listEvents, 
    add : function(node, sEventName, fHandler) {
            listEvents.push(arguments);
          },
    flush : function() {
              var i, item;
              for(i = listEvents.length - 1; i >= 0; i = i - 1) {
                item = listEvents[i];
                if(item[0].removeEventListener) {
                  item[0].removeEventListener(item[1], item[2], item[3]);
                };
                if(item[1].substring(0, 2) != "on") {
                  item[1] = "on" + item[1];
                };
                if(item[0].detachEvent) {
                  item[0].detachEvent(item[1], item[2]);
                };
                item[0][item[1]] = null;
              };
	    }
    };
  }();
addEvent(window,'unload',EventCache.flush);

// return the object that was just targeted by the event
function getTarget(evt)
{
  if (evt && evt.target)   //Moz
    return evt.target;
  else if(window.event)    //IE
    return window.event.srcElement;
  else                     //no event
    return;
}

// return the first parent object with the id prefix
function findObjParentById(el, id)
{
  if(el.id && el.id.indexOf(id) == 0) {
    return el;
  } else {
    return findObjParentById(el.parentNode, id);
  }
}

// get the kode of the key that was just pressed
// This is from http://www.howtocreate.co.uk/tutorials/index.php?tut=0&part=17  
function getKeyCode(e)
{
  if( !e ) {
    //if the browser did not pass the event information to the
    //function, we will have to obtain it from the event register
    if( window.event ) {
        //DOM
      e = window.event;
    } else {
      //TOTAL FAILURE, WE HAVE NO WAY OF REFERENCING THE EVENT
      return;
    }
  }
  if( typeof( e.which ) == 'number' ) {
     //NS 4, NS 6+, Mozilla 0.9+, Opera
     e = e.which;
  } else if( typeof( e.keyCode ) == 'number'  ) {
     //IE, NS 6+, Mozilla 0.9+
     e = e.keyCode;
  } else if( typeof( e.charCode ) == 'number'  ) {
     //also NS 6+, Mozilla 0.9+
     e = e.charCode;
  } else {
     //TOTAL FAILURE, WE HAVE NO WAY OF OBTAINING THE KEY CODE
     return;
  }
  //window.alert('The key pressed has keycode ' + e + ' and is key ' + String.fromCharCode( e ) );
  return e;
}

// this cruft is an example I grabbed where the author distinguishes between single and double clicks
// might be useful someday

//var dcTime=250;    // doubleclick time
//var dcDelay=100;   // no clicks after doubleclick
//var dcAt=0;        // time of doubleclick
//var savEvent=null; // save Event for handling doClick().
//var savEvtTime=0;  // save time of click event.
//var savTO=null;    // handle of click setTimeOut
// 
//function showMe(form, txt) {
//  document.forms[form].elements[0].value += txt;
//}
// 
//function hadDoubleClick() {
//  var d = new Date();
//  var now = d.getTime();
//  showMe(1, "Checking DC (" + now + " - " + dcAt);
//  if ((now - dcAt) < dcDelay) {
//    showMe(1, "*hadDC*");
//    return true;
//  }
//  showMe(1, " OK ");
//  return false;
//}
// 
//function handleWisely(which) {
//  showMe(1, which + " fired...");
//  switch (which) {
//    case "click": 
//      // If we've just had a doubleclick then ignore it
//      if (hadDoubleClick()) return false;
//       
//      // Otherwise set timer to act.  It may be preempted by a doubleclick.
//      savEvent = which;
//      d = new Date();
//      savEvtTime = d.getTime();
//      savTO = setTimeout("doClick(savEvent)", dcTime);
//      break;
//    case "dblclick":
//      doDoubleClick(which);
//      break;
//    default:
//  }
//}
// 
//function doClick(which) {
//  // preempt if DC occurred after original click.
//  if (savEvtTime - dcAt <= 0) {
//    showMe(1, "ignore Click");
//    return false;
//  }
//  showMe(1, "Handle Click.  ");
//}
// 
//function doDoubleClick(which) {
//  var d = new Date();
//  dcAt = d.getTime();
//  if (savTO != null) {
//    clearTimeout( savTO );          // Clear pending Click  
//    savTO = null;
//  }
//  showMe(1, "Handle DoubleClick at " + dcAt);
//}