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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<body>
<input type='text' onkeyup='tes(this)' />
<script type="text/javascript">
var exs = "";
var pt1 = /^\d{0,5}$/;
var pt2 = /^\d{0,5}\.\d{0,2}$/;
function tes(obj){
if(obj.value.length<=5){
if(pt1.exec(obj.value)!=null){
exs = obj.value;
}else{
obj.value=exs;
}
}else{
if(pt2.exec(obj.value)!=null){
exs = obj.value;
}else{
obj.value=exs;
}
}
}
</script>
</body>
</html>