$(document).ready(function(){
$(".collapselink").click(function(){
$("#headerimage").slideToggle(function(){
if($("#headerimage").is(":hidden")){
$(".collapselink").css("background-image","url(../images/tonen-bg.png)");
}else{
$(".collapselink").css("background-image","url(../images/verbergen-bg.png)");
}
});
});
$(".collapselink").hover(function(){
$(this).css("cursor","pointer");
});
});