var ns4 = document.layers;
var op5 = (navigator.userAgent.indexOf("Opera 5")!=-1) 
	||(navigator.userAgent.indexOf("Opera/5")!=-1);
var op6 = (navigator.userAgent.indexOf("Opera 6")!=-1) 
	||(navigator.userAgent.indexOf("Opera/6")!=-1);
var agt=navigator.userAgent.toLowerCase();
var mac = (agt.indexOf("mac")!=-1);
var ie = (agt.indexOf("msie") != -1); 
var mac_ie = mac && ie;
var moz = !ie && navigator.product == "Gecko";


function isdefined(variable) {
    return (typeof(variable) == "undefined")?  false: true;
}

function addEvent( obj, type, fn ) {
    
  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] );
  } else
    obj.addEventListener( type, fn, false );

}
function removeEvent( obj, type, fn ) {
  if ( obj.detachEvent ) {
    obj.detachEvent( 'on'+type, obj[type+fn] );
    obj[type+fn] = null;
  } else
    obj.removeEventListener( type, fn, false );
}

function playYouTubeVideo(triggerElement,videoElement) {

    if (document.getElementById(videoElement) && triggerElement) {

        triggerElement.className = 'hide';

        var moviePlayer = document.getElementById(videoElement);
            moviePlayer.className='show';
            moviePlayer.playVideo();

    }

}