thanks this is what i ended up using

for the record this is a vertical slider that slides down in portrait mode

[SlideToUnlock]
SizeL="140;480"
SizeP="142;190"

PosL="right;30"
PosP="120;505"

SliderImage="/home/user/MyDocs/.lockbg/unlock1.png"

SliderPos="0;0"
#UnlockXL=340
#UnlockXP=0
UnlockYL=310
UnlockYP=48