if (document.images)
    {   var homeOff = new Image()
        homeOff.src = "images/buttons_01.gif"
        var homeOn = new Image()
        homeOn.src = "images/buttons_over_01.gif"

        var overviewOff = new Image()
        overviewOff.src = "images/buttons_02.gif"
        var overviewOn = new Image()
        overviewOn.src = "images/buttons_over_02.gif"
      		
		var scheduleOff = new Image()
        scheduleOff.src = "images/buttons_03.gif"
        var scheduleOn = new Image()
        scheduleOn.src = "images/buttons_over_03.gif"
		
		var abstractsOff = new Image()
        abstractsOff.src = "images/buttons_04.gif"
        var abstractsOn = new Image()
        abstractsOn.src = "images/buttons_over_04.gif"
		
		var accommodationOff = new Image()
        accommodationOff.src = "images/buttons_05.gif"
        var accommodationOn = new Image()
        accommodationOn.src = "images/buttons_over_05.gif"
		
		var showcaseOff = new Image()
        showcaseOff.src = "images/buttons_06.gif"
        var showcaseOn = new Image()
        showcaseOn.src = "images/buttons_over_06.gif"
		
		var lectureOff = new Image()
        lectureOff.src = "images/buttons_07.gif"
        var lectureOn = new Image()
        lectureOn.src = "images/buttons_over_07.gif"
		
		var registrationOff = new Image()
        registrationOff.src = "images/buttons_08.gif"
        var registrationOn = new Image()
        registrationOn.src = "images/buttons_over_08.gif"
		
		var sponsorsOff = new Image()
        sponsorsOff.src = "images/buttons_09.gif"
        var sponsorsOn = new Image()
        sponsorsOn.src = "images/buttons_over_09.gif"
		
		var location_mapOff = new Image()
        location_mapOff.src = "images/buttons_10.gif"
        var location_mapOn = new Image()
        location_mapOn.src = "images/buttons_over_10.gif"
				
		var contactOff = new Image()
        contactOff.src = "images/buttons_11.gif"
        var contactOn = new Image()
        contactOn.src = "images/buttons_over_11.gif"
		
}		
function inact(imgName)
{
	if(document.images)
		document[imgName].src = eval(imgName+'Off.src')
}

function act(imgName)
{
	if(document.images)
		document[imgName].src = eval(imgName+'On.src')
}

function openWin(theURL,winName,features) {
  window.open(theURL,winName,features);
}