//preload buttons
		imgGo = new Image();
		imgGo.src = 'Images/Buttons/Go.gif';
		imgGoOn = new Image();
		imgGoOn.src = 'Images/Buttons/GoOn.gif';
		
		imgFindJurisd = new Image();
		imgFindJurisd.src = 'Images/Buttons/FindJurisdiction.gif';
		imgFindJurisdOn = new Image();
		imgFindJurisdOn.src = 'Images/Buttons/FindJurisdictionOn.gif';
		
		imgFindAgency = new Image();
		imgFindAgency.src = 'Images/Buttons/FindAgency.gif';
		imgFindAgencyOn = new Image();
		imgFindAgencyOn.src = 'Images/Buttons/FindAgencyOn.gif';
		
		imgFindSeries = new Image();
		imgFindSeries.src = 'Images/Buttons/FindSeries.gif';
		imgFindSeriesOn = new Image();
		imgFindSeriesOn.src = 'Images/Buttons/FindSeriesOn.gif';
		
		imgOrderBy = new Image();
		imgOrderBy.src = 'Images/Buttons/OrderBy.gif';
		imgOrderByOn = new Image();
		imgOrderByOn.src = 'Images/Buttons/OrderByOn.gif';
		
		imgNext = new Image();
		imgNext.src = 'Images/Buttons/Next.gif';
		imgNextOn = new Image();
		imgNextOn.src = 'Images/Buttons/NextOn.gif';
		
		imgPrevious = new Image();
		imgPrevious.src = 'Images/Buttons/Previous.gif';
		imgPreviousOn = new Image();
		imgPreviousOn.src = 'Images/Buttons/PreviousOn.gif';
		
		//preload images for model
		imgModel = new Image();
		imgModel.src = 'Images/Model/Model.gif';

		imgOrg = new Image();
		imgOrg.src = 'Images/Model/Organisation.gif';
		imgOrgOn = new Image();
		imgOrgOn.src = 'Images/Model/OrganisationOn.gif';
		
		imgJurisd = new Image();
		imgJurisd.src = 'Images/Model/Jurisdiction.gif';
		imgJurisdOn = new Image();
		imgJurisdOn.src = 'Images/Model/JurisdictionOn.gif';
		
		imgSeries = new Image();
		imgSeries.src = 'Images/Model/Series.gif';
		imgSeriesOn = new Image();
		imgSeriesOn.src = 'Images/Model/SeriesOn.gif';
		
		imgAgency = new Image();
		imgAgency.src = 'Images/Model/Agency.gif';
		imgAgencyOn = new Image();
		imgAgencyOn.src = 'Images/Model/AgencyOn.gif';
		
		imgFunction = new Image();
		imgFunction.src = 'Images/Model/Function.gif';
		imgFunctionOn = new Image();
		imgFunctionOn.src = 'Images/Model/FunctionOn.gif';
		
		imgRecords = new Image();
		imgRecords.src = 'Images/Model/Records.gif';
		imgRecordsOn = new Image();
		imgRecordsOn.src = 'Images/Model/RecordsOn.gif';
		
		imgDisposalAuthority = new Image();
		imgDisposalAuthority.src = 'Images/Model/DisposalAuthority.gif';
		imgDisposalAuthorityOn = new Image();
		imgDisposalAuthorityOn.src = 'Images/Model/DisposalAuthorityOn.gif';