//This does what is says go to the last month


function goLastMonth(self, month, year){
// If the month is January, decrement the year
if(month == 1){
--year;
month = 13;
}
document.location.href = self+ '?month='+(month-1)+'&year='+year;

}

//This does what is says go to the next month
//next function
function goNextMonth(self, month, year){
// If the month is December, increment the year
if(month == 12){
++year;
month = 0;
}

document.location.href = self + '?month='+(month+1)+'&year='+year;
}