How to get next month date

Hello,

I don't know xml very well and I am struggling with getting next month (for example February) based on the current date

I need to place this phrase "In full satisfaction of February 2012 rent" on the check template."

I have this conditional formating but based on te current date I always need to dispaly nect month.

<?if:number(SupplierNumber)=number(200798)?>In full satisfaction of <?xdoxslt:current_date($_XDOLOCALE, $_XDOTIMEZONE)?>  rent <?end if?>.

Any help would be greatly appreciated.

Thank you,

Elizabeth