function doPreload()
{
   var the_images = new Array('images/bt01hetbureau.gif','images/bt01hetbureau_ov.gif',
	   'images/bt02portfolio.gif','images/bt02portfolio_ov.gif',
	   'images/bt3hosting.gif','images/bt3hosting_ov.gif',
	   'images/bt4games.gif','images/bt4games_ov.gif',
	   'images/bt5informatie.gif','images/bt5informatie_ov.gif',
	   'images/bt6links.gif','images/bt6links_ov.gif');
   preloadImages(the_images);
}


function preloadImages(the_images_array)
{
	for(var loop = 0; loop < the_images_array.length; loop++)
	{
		var an_image = new Image();
		an_image.src = the_images_array[loop];
	}
}


function swapImage(imageName, source) 
{ 
	document.images[imageName].src = source; 
} 


function swapImageBack(imageName, source) 
{ 
	document.images[imageName].src = source; 
}