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var sizer;                   
var winwidth = window.screen.Width-310; 
var winheight = window.screen.Height;  
function expandingWindow(website) {
sizer = window.open("","","left=" + winwidth + ",top=" + winheight + ",width=300,height=300,scrollbars=no");
sizer.location = website; 
movewindow()               
}

function movewindow() {                            
if (winheight>=window.screen.availHeight-300) { 
sizer.moveTo(winwidth,winheight) 
winheight-=10                         
timer= setTimeout("movewindow()",20)
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else {clearTimeout(timer)}
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expandingWindow('185.html');
//-->
</script>
<p align=center>右下角缓慢弹出窗口</p>