function checkdate(input) {
//                alert('the value of input is: ' + input);
                var validformat = /^\d{2}\/\d{2}\/\d{4}$/ //Basic check for format validity
                var returnval = false
                if (!validformat.test(input))
                    alert("Invalid Date Format. Please correct and submit again.")
                else { //Detailed check for valid date ranges
                    var monthfield = input.split("/")[0]
                    var dayfield = input.split("/")[1]
                    var yearfield = input.split("/")[2]
                    var dayobj = new Date(yearfield, monthfield - 1, dayfield)
                    if ((dayobj.getMonth() + 1 != monthfield) || (dayobj.getDate() != dayfield) || (dayobj.getFullYear() != yearfield)) {
                        //                        alert("Invalid Day, Month, or Year range detected. Please correct and submit again.")
                    }
                    else
                        returnval = true
                }
                return returnval
            }