$(document).ready(function(){
						   $('.rondje1_groot').fadeTo("slow",0.15);
						   $('.rondje2_groot').fadeTo("slow",0.15);
						   $('.rondje3_groot').fadeTo("slow",0.15);


						   
						   $('.rondje1_groot, .content_box3').hover(function(){
														$('.rondje1_groot').fadeTo("fast",0.3);
														$('.content_box3').css("background-image","url(./img/content_box_hover.png)");
														},
														function () {
    													$('.rondje1_groot').fadeTo("fast",0.15);
														$('.content_box3').css("background-image","url(./img/content_box.png)");
														});
						   $('.rondje2_groot, .content_box1').hover(function(){
														$('.rondje2_groot').fadeTo("fast",0.3);
														$('.content_box1').css("background-image","url(./img/content_box_hover.png)");
														}, 
  														function () {
    													$('.rondje2_groot').fadeTo("fast",0.15);
														$('.content_box1').css("background-image","url(./img/content_box.png)");
														});
						   $('.rondje3_groot, .content_box2').hover(function(){
														$('.rondje3_groot').fadeTo("fast",0.3);
														$('.content_box2').css("background-image","url(./img/content_box2_hover.png)");
														},
  														function () {
    													$('.rondje3_groot').fadeTo("fast",0.15);
														$('.content_box2').css("background-image","url(./img/content_box2.png)");
														});
						   });