query calc

Hi guys,

I'm trying to find a way how to prevent users from insert string to price textbox so I found something like this:
Actually it works fine, the only issue is users can't insert dot as well just numbers

 $("#Price").keypress(function (e) {
                //if the letter is not digit then display error and don't type anything
                if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {
                    //display error message
                    //$("#error").html("Number Only").show().fadeOut("slow");
                    return false;
                }
            });

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