Computer Craft: Wireless Mining Turtle Running Out of Resources?

[OscarWilde]

I hate Lua... I'm sure its easy but if you already know java then learning another syntax is a bit of a nuisance... anyway my program works for my turtle (I'm using it to make the windows (walls) of a highrise building)

EXCEPT

the turtle (his name is steve) stops placing blocks after 64 (One stack). Obviously this is because I'm not telling him to use the glass blocks from his other inventory slots but I don't know how. I'm sure its just a matter of using an if statement (ie. "if slot 1 ==0...."make slot 2 inventory? or move slot 2 to 1?) but I don't know... any help?

Thanks!