onunload关闭刷新判断

<script FOR=window EVENT=onunload>
var n = window.event.screenX - window.screenLeft;
var b = n > document.documentElement.scrollWidth-20;
if(b && window.event.clientY < 0 || window.event.altKey) {
//close	
} else {
//refurbish  
}
</script>