With below Javascript code, you can easily create counter in your webpage.
<html> <head> <title>Untitled Document</title> </head> <body> <form name="counter"> <input type="text" size="8" name="d2"> </form> <script>
var milisec=0
var seconds=30
document.counter.d2.value='30'
function display(){
if (milisec<=0){
milisec=9
seconds-=1
}
if (seconds<=-1){
milisec=0
seconds+=1
}
else
milisec-=1
document.counter.d2.value=seconds+"."+milisec
setTimeout("display()",1000);
}
display()
</script> </body> </html>

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