function close_win(){
var nvua = navigator.userAgent;
if(nvua.indexOf('MSIE') >= 0){
if(nvua.indexOf('MSIE 5.0') == -1) {
top.opener = '';
}
}
else if(nvua.indexOf('Gecko') >= 0){
top.name = 'CLOSE_WINDOW';
wid = window.open('','CLOSE_WINDOW');
}
top.close();
}

	function cha_img(img){
		document.IMG.src=img;
	}
	
function rollover(imgid,imgfile ){
if(document.layers) document.images[imgid].src = imgfile;
else document.getElementById(imgid).src = imgfile;}