Restrict user to enter Zero (0) in TextBox using ASP.Net CustomValidator in JavaScript

Hi There,

I have a validation on a textbox that accepts only numerics, I want that same text box not to accept only figure 0 as an input. The textbox is supposed to receive number of Months. 0 is not a valid number of months.

                function validateFloatKeyPress(el, evt) {
                    var charCode = (evt.which) ? evt.which : event.keyCode;
                    var number = el.value.split('.');
                    if (charCode != 46 && charCode > 31 && (charCode < 48 || charCode > 57)) {
                        return false;
                    }
                    //just one dot (thanks ddlab)
                    if (number.length > 1 && charCode == 46) {
                        return false;
                    }
                    //get the carat position
                    var caratPos = getSelectionStart(el);
                    var dotPos = el.value.indexOf(".");
                    if (caratPos > dotPos && dotPos > -1 && (number[1].length > 1)) {
                        return false;
                    }
                    return true;
                }