<input type="text" name="money" required style="width: 15%" value="0" onblur="onlyNum(this)" />
<script>
function onlyNum(that){
var vv = Math.round(that.value.replace(/[^\d.]/g,"") * 100) /100;
vv += "";
if(vv.indexOf(".")>-1){
that.value = vv;
}else{
that.value = vv+".00";
}
}
</script>