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<span id="timer" style="color:red;">3</span> วินาที 


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var pastTime = 3; 

function mycountdown(){ 
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            pastTime -= 1; 
            document.getElementById('timer').innerHTML = pastTime; 
      } 
if(pastTime < 1) { 
            window.location = "web_size.php?action=refresh&webID=" 
      } 
} 
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		setInterval(mycountdown,1000); 
	}
</script>