if (document.images) {
    var preload_image_object = new Image();
    var image_url = new Array();
    image_url[0] = "/i/hoofdpagina/knop_selected.jpg";
    image_url[1] = "/i/hoofdpagina/knop_uitklap.jpg";
    image_url[2] = "/i/hoofdpagina/knop_normaal.jpg";
    
    var i = 0;
    for (i = 0; i <= 3; i++) 
        preload_image_object.src = image_url[i];
}

window.addEvent('domready', function() {
	
	var Slide1 = new Fx.Slide('menu1_items');
	var Slide2 = new Fx.Slide('menu2_items');
	var Slide3 = new Fx.Slide('menu3_items');
	var Slide4 = new Fx.Slide('menu4_items');	
	Slide1.hide();
	Slide2.hide();
	Slide3.hide();
	Slide4.hide();
	var close1;
	var close2;
	var close3;
	var close4;


	    $('menu1').addEvent('mouseenter', function(event){

 Slide1.cancel();
			 Slide1.slideIn();
	    });
		
	    $('menu1').addEvent('mouseleave', function(event){
			 
		  Slide1.cancel();
			 Slide1.slideOut(); 
	    });
		
		$('menu1_items_h').addEvent('mouseenter', function(event){

			 		   Slide1.cancel();

			 Slide1.show();
	    });
		$('menu1_items_h').addEvent('mouseleave', function(event){
	 		
    			 Slide1.cancel();
	    		 Slide1.slideOut();
	    });
	
	
   	    $('menu2').addEvent('mouseover', function(event2){
			  Slide2.cancel();
			  Slide2.slideIn();
	    });
		
	    $('menu2').addEvent('mouseout', function(event2){
			 Slide2.cancel();
			 Slide2.slideOut();
	    });
		
		$('menu2_items_h').addEvent('mouseover', function(event2){
	 		Slide2.cancel();
			 Slide2.show();
	    });
		$('menu2_items_h').addEvent('mouseout', function(event2){
	 		 Slide2.cancel();
			 Slide2.slideOut();
	    });
		
		
		$('menu3').addEvent('mouseover', function(event3){
			Slide3.cancel();
			 Slide3.slideIn();
	    });
		
	    $('menu3').addEvent('mouseout', function(event3){
			 Slide3.cancel();
			 Slide3.slideOut();
	    });
		
		$('menu3_items_h').addEvent('mouseover', function(event3){
	 		Slide3.cancel();
			 Slide3.show();
	    });
		$('menu3_items_h').addEvent('mouseout', function(event3){
	 		Slide3.cancel();
			Slide3.slideOut(); 
	    });
   	

   
}
);