function rollover(nom_image,image_swap){
                preload_image = new Image(150,40); 
                preload_image.src=image_swap; 
		window.document.images[nom_image].src=image_swap;
 }	

function ouvre_popup(page){
                window.open(page, "conditions", "depedent=no, width=650, height=600, location=no, menubar=no, toolbar=no, resizeable=no, scrollbars=yes, top=0, left=0");
}