Decimal value check code

<script type="text/javascript" language="javascript">

function isDecimal(str){

if(isNaN(str) || str.indexOf(".")<0){

alert("Invalid");

}

else{

str=parseFloat(str);

alert(str.toFixed(2))

alert ("Entered number is decimal")

}

}

function validate(){

var dec=document.form.num.value;

if (dec == ""){

alert("Please enter.");

form.num.focus();

return false;

}

if (isDecimal(dec)==false){

num="";

form.num.focus();

return false;

}

return true;

}

</script>

<form name="form" method="post" onsubmit="return validate();">

Enter Decimal Number:<input type="text" name="num"> <input

type="submit" value="Check">

</form>