showOn: 'focus',    // 'focus' for popup on focus,
                    // 'button' for trigger button, or 'both' for either
showAnim: 'fadeIn', // Name of jQuery animation for popup
buttonText: '...',  // Text for trigger button
buttonImage: '',    // URL for trigger button image
changeYear: false,  // True if year can be selected directly, false if only prev/next
yearRange: 'c-10:c+10', // Range of years to display in drop-down,
                        // either relative to today's year (-nn:+nn), relative to currently displayed year
                        // (c-nn:c+nn), absolute (nnnn:nnnn), or a combination of the above (nnnn:-n)
beforeShow: null,   // Function that takes an input field and
                    // returns a set of custom settings for the date picker
onSelect: null,     // Define a callback function when a date is selected
onChangeYear: null, // Define a callback function when the year is changed
onClose: null,      // Define a callback function when the monthpicker is closed
stepYears: 1,       // Number of months to step back/forward
altField: '',       // Selector for an alternate field to store selected dates into
altFormat: '',      // The date format to use for the alternate field
disabled: false     // The initial disabled state

dateFormat: 'mm/yy',
yearSuffix: ''      // Additional text to append to the year in the month headers
prevText: 'Prev',   // Display text for previous month link
nextText: 'Next',   // Display text for next month link
monthNames: ['January','February','March','April','May','June', 'July','August','September','October', 'November','December'], // Names of months for drop-down and formatting
monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'], // For formatting