var preloadFlag = false;
// Start of image definitions (the images to swap based on JavaScript events)
function preloadImages()
{
	if( document.images ) {
    	HomeRO 			= newImage( "images/HomeBtnRO.gif" );
		HomeClick 		= newImage( "images/HomeBtnClick.gif" );
    	BiosRO 			= newImage( "images/BiosBtnRO.gif" );
		BiosClick 		= newImage( "images/BiosBtnClick.gif" );
    	SamplesRO 		= newImage( "images/SamplesBtnRO.gif" );
		SamplesClick 	= newImage( "images/SamplesBtnClick.gif" );
    	ContactsRO 		= newImage( "images/ContactsBtnRO.gif" );
		ContactsClick 	= newImage( "images/ContactsBtnClick.gif" );
       	preloadFlag = true;
   }
}

function newImage( arg )
{
   	if( document.images ) {
       rslt = new Image();
       rslt.src = arg;
       return rslt;
   	}
}

function changeImages()
{
   	if( document.images && ( preloadFlag == true ) ) {
       	for( var i = 0; i < changeImages.arguments.length; i += 2 ) {
           document[ changeImages.arguments[ i ] ].src = changeImages.arguments[ i + 1 ];
       	}
   	}
}