function ok(id){if(document.all(id).style.display == "none"){document.all(id).style.display="block";}else{document.all(id).style.display="none";}} 

function _chgimg(imgName,imgUrl){ document.images[imgName].src = imgUrl; }
function popup(news){
window.open(news,'new_window','scrollbars=yes,width=500,height=700')
}