greendoton = new Image();
greendotoff = new Image();
helpbeon = new Image();
helpinvestigate = new Image();
helpknowhow = new Image();
helpexplore = new Image();
helpdoit = new Image();
helptalkabout = new Image();
helpteachersguide = new Image();
helpfeedback = new Image();
helpmagazine = new Image();
helpwhen = new Image();
helpabout = new Image();
helpoff = new Image();
exploreon = new Image();
exploreoff = new Image();
investigateon = new Image();
investigateoff = new Image();	
knowhowon = new Image();
knowhowoff = new Image();
doiton = new Image();
doitoff = new Image();
beonon = new Image();
beonoff = new Image();
talkabouton = new Image();
talkaboutoff = new Image();
whensitonon = new Image();
whensitonoff = new Image();

greendoton.src = "../images/greendot_roll.gif";
greendotoff.src = "../images/greendot.gif";
helpbeon.src = "../images/help_beon.gif";
helpinvestigate.src = "../images/help_investigate.gif";
helpknowhow.src = "../images/help_knowhow.gif";
helpexplore.src = "../images/help_explore.gif";
helpdoit.src = "../images/help_doit.gif";
helptalkabout.src = "../images/help_talkabout.gif";
helpteachersguide.src = "../images/help_teachersguide.gif";
helpfeedback.src = "../images/help_feedback.gif";
helpmagazine.src = "../images/help_magazine.gif";
helpwhen.src = "../images/help_when.gif";
helpabout.src = "../images/help_about.gif";
helpoff.src = "../images/help_dragonfly.gif";	
exploreon.src = "../images/explore_roll.gif";
exploreoff.src = "../images/explore.gif";
investigateon.src = "../images/investigatethis_roll.gif";
investigateoff.src = "../images/investigatethis.gif";
knowhowon.src = "../images/knowhow_roll.gif";
knowhowoff.src = "../images/knowhow.gif";
doiton.src = "../images/doit_roll.gif";
doitoff.src = "../images/doit.gif";
beonon.src = "../images/beon_roll.gif";
beonoff.src = "../images/beon.gif";
talkabouton.src = "../images/talkabout_roll.gif";
talkaboutoff.src = "../images/talkabout.gif";
whensitonon.src = "../images/whensiton_roll.gif";
whensitonoff.src = "../images/whensiton.gif";


var alreadyopen = new Array();
var newwin = new Array();

function openWindow(theURL,winName,features,wid,hei){

	var winl = (screen.width - wid - 10) / 2;
	var wint = (screen.height - hei - 29) / 2;
	var winpos = ',height='+hei+',width='+wid+',top='+wint+',left='+winl;
	
	if(alreadyopen[winName]){
		if(!newwin[winName].closed){
			newwin[winName].focus();
			return false;	
		}
		else{
			newwin[winName] = window.open(theURL,winName,features + winpos);
			return newwin[winName];
		}
	}
	else{
		alreadyopen[winName] = 1;	
		newwin[winName] = window.open(theURL,winName,features + winpos);
		newwin[winName].focus();
		return newwin[winName];
	}
	return false;
}


function visit(newURL) {
	if (newURL != "")	{
		newURL=newURL
		location.href=newURL
	}
}