if (document.images) {
var button_1a=new Image();
button_1a.src="/images/main/button_1a.jpg";
var button_1b=new Image();
button_1b.src="/images/main/button_1b.jpg";
var button_2a=new Image();
button_2a.src="/images/main/button_2a.jpg";
var button_2b=new Image();
button_2b.src="/images/main/button_2b.jpg";
var button_3a=new Image();
button_3a.src="/images/main/button_3a.jpg";
var button_3b=new Image();
button_3b.src="/images/main/button_3b.jpg";
var button_4a=new Image();
button_4a.src="/images/main/button_4a.jpg";
var button_4b=new Image();
button_4b.src="/images/main/button_4b.jpg";
var button_5a=new Image();
button_5a.src="/images/main/button_5a.jpg";
var button_5b=new Image();
button_5b.src="/images/main/button_5b.jpg";
var button_6a=new Image();
button_6a.src="/images/main/button_6a.jpg";
var button_6b=new Image();
button_6b.src="/images/main/button_6b.jpg";
var button_7a=new Image();
button_7a.src="/images/main/button_7a.jpg";
var button_7b=new Image();
button_7b.src="/images/main/button_7b.jpg";
var button_8a=new Image();
button_8a.src="/images/main/button_8a.jpg";
var button_8b=new Image();
button_8b.src="/images/main/button_8b.jpg";
}
else {
alert("Helaas, u heeft een te oude browser.");
}