if (document.images) {
 img_off=new Image();  img_off.src="images/button.gif";
 img1_on =new Image(); img1_on.src ="images/linea.jpg";
 img2_on =new Image(); img2_on.src ="images/rembo.jpg"; 
 img3_on =new Image(); img3_on.src ="images/marylise.jpg"; 
 img4_on =new Image(); img4_on.src ="images/oni.jpg"; 
}
function movr(k) {
 if (document.images) 
  eval('document.collectie.src=img'+k+'_on.src');
}
function mout(k) {
 if (document.images) 
  eval('document.collectie.src=img_off.src');
}