function preload(image) {
	imageObj = new Image();
	imageObj.src= image;	
}
$(document).ready(function(){
	var albums = Array('zweden',"oeganda",'bangladesh','rest','alpen','nederland');
	var preloads = Array;
	for(var i=0;i<albums.length;i++){
    $('.'+albums[i]).mouseover(function(){$(this).css("background-image","url(/images/"+$(this).attr('class')+".png)")});
		$('.'+albums[i]).mouseout(function(){$(this).css("background-image","none")});
		preload("images/"+albums[i]+".png");
	}
});