Scrolling background stops after awhile? [closed]

Question

Can anyone tell me where my maths is wrong please, it stops scrolling after awhile.

if (background.position.y < background2.position.y)
{
    background.position = ccp(background.contentSize.width / 2, background.position.y - 50 * delta);
    background2.position = ccp(background.contentSize.width / 2, background.position.y + background.contentSize.height);
}
else
{
    background.position = ccp(background2.contentSize.width / 2, background2.position.y - 50 * delta);
    background.position = ccp(background2.contentSize.width / 2, background2.position.y + background.contentSize.height);
}

//reset
if (background.position.y <-background.contentSize.height / 2)
{
    background.position = ccp(background.contentSize.width / 2 ,background2.position.y + background2.contentSize.height);
} 
else if (background2.position.y < -background2.contentSize.height / 2)
{
    background2.position = ccp(background2.contentSize.width / 2, background.position.y + background.contentSize.height);
}

Answer 1

Looks like you you have duplicated the background position twice in the else part. I've inserted the 2 below

else
{
    background.position = ccp(background2.contentSize.width / 2, background2.position.y - 50 * delta);
    background.position = ccp(background2.contentSize.width / 2, background2.position.y + background.contentSize.height);
}

Added: After the else statement you have background.position = .... in twice.

The first one needs to be background2.position