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Cocos2d random issue
CCSprite *ladyBug = [CCSprite spriteWithFile:@"Bug-1.png"];

// Determine where to spawn the target along the Y axis
CGSize winSize = [[CCDirector sharedDirector] winSize];
int minY = ladyBug.contentSize.width/2;
int maxY = winSize.width - ladyBug.contentSize.width/2;
int rangeY = maxY - minY;
int random = (arc4random() % rangeY) + minY;

// Create the target slightly off-screen along the right edge,
// and along a random position along the Y axis as calculated above
ladyBug.position = ccp(random, -(ladyBug.contentSize.height));
bugIndexes++;
ladyBug.tag = bugIndexes;
[self addChild:ladyBug];


// Determine speed of the target
int minDuration = 2.0;
int maxDuration = 3.0;
int rangeDuration = maxDuration - minDuration;
int actualDuration = (arc4random() % rangeDuration) + minDuration;

// Create the actions
id actionMove = [CCMoveTo actionWithDuration:actualDuration position:ccp( random , winSize.height + ladyBug.contentSize.height)];
id actionMoveDone = [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)];
[ladyBug runAction:[CCSequence actions:actionMove, actionMoveDone, nil]];