var isIE = ((document.all)? true  : false );
var isNS6 = ((document.getElementById && !document.all)? true: false );


if (!document.getElementById){
	document.getElementById = function (id){
							if (document.all){
								return document.all[id];
							}
						}
}


var fatherNames = ["","navHomepage","navSites","navSocial","navSpeaker","navProgram","navForm","navHotel","navContact","navPresentations","navPictures" ];
var fatherOnImgs = [];
var fatherOffImgs = [];
var fixNav = 0;

for (var i=1; i<=10; i++){
	fatherOnImgs [i] = new Image ();	
	fatherOffImgs [i] = new Image ();
}
	
fatherOnImgs [1].src = "images/nav_homepageon.gif";
fatherOnImgs [2].src = "images/nav_sites_informationon.gif";
fatherOnImgs [3].src = "images/nav_social_eventson.gif";
fatherOnImgs [4].src = "images/nav_speakeron.gif";
fatherOnImgs [5].src = "images/nav_programon.gif";
fatherOnImgs [6].src = "images/nav_registration_formon.gif";
fatherOnImgs [7].src = "images/nav_hotel_travelon.gif";
fatherOnImgs [8].src = "images/nav_contact_uson.gif";
fatherOnImgs [9].src = "images/nav_Presentationson.gif";
fatherOnImgs [10].src = "images/nav_Pictureson.gif";

fatherOffImgs [1].src = "images/nav_homepage.gif";
fatherOffImgs [2].src = "images/nav_sites_information.gif";
fatherOffImgs [3].src = "images/nav_social_events.gif";
fatherOffImgs [4].src = "images/nav_speaker.gif";
fatherOffImgs [5].src = "images/nav_program.gif";
fatherOffImgs [6].src = "images/nav_registration_form.gif";
fatherOffImgs [7].src = "images/nav_hotel_travel.gif";
fatherOffImgs [8].src = "images/nav_contact_us.gif";
fatherOffImgs [9].src = "images/nav_Presentations.gif";
fatherOffImgs [10].src = "images/nav_Pictures.gif";


function navOver(navNum , isOver ){
	if (!document.images[ fatherNames[navNum] ] || fixNav==navNum )return ; 
	
	if (isOver){
		document.images[ fatherNames[navNum] ].src =  fatherOnImgs[navNum].src ;
	}else{
		document.images[ fatherNames[navNum] ].src =  fatherOffImgs[navNum].src ;
	}

}

function markNav(){
	document.images[ fatherNames[fixNav] ].src =  fatherOnImgs[fixNav].src ;
	document.getElementById("nav"+fixNav).className = "sel" ; 
}