function popup(page,nom,popwidth,popheight) {
	var screwidth=screen.width;
	var screheight=screen.height;
	screwidth=(screwidth-500)/2;
	screheight=(screheight-500)/2;
	window.open(page,nom,"height="+popheight+",width="+popwidth+",left="+screwidth+",top="+screheight);
}

function mouseov(id,img){
	id.src=img;
}