[PHP] auto increment

[nate]

you know how, if you make a field a primary key and have it auto increment... then if 
you delete an entry and add a new one it makes the field 2 instead of 1... i know 
thats explained bad but do you know what i mean? is there a way to make it go back to 
1 as if there were never any fields entered?

Thanks,
Nate