/*Function XmasDays() 
Purpose: Calculate the number of days between Christmas and a given date.

Variables
CheckDay: A date object containing the given date 
XYear: The 4 digit year value of the given date
XDay: December 25 in the year of the given date
DayCount:  The number of days betweenChristmas and the given date
*/

function XmasDays(CheckDay){
var XYear=CheckDay.getFullYear();
var XDay=new Date("December, 25, 2007");
XDay.setFullYear(XYear);
var DayCount=(XDay-CheckDay)/(1000*60*60*24);
DayCount=Math.round(DayCount);
return DayCount;
}