<html>
<body>
<form action="https://maps.google.com/maps" method="get" name="f" onsubmit="return check()">
<input name="q" type="text"/> <br/>
<input name="send" type="submit" value="search"/>
</form>
</body>
<script>
var floatReg=/^([+-]?)[1-9]\d*(\.\d*)?,([+-]?[1-9]\d*(\.\*)?$)/;
function check(){
if(!floatReg.test(f.q.value)){
alert("It's not correct format,please retry");
f.q.value="";
document.f.q.focus();
return false;
}
}
document.write(Date());
</script>
</html>
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