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Accounting for splits in a stock price graph
One way that is common is to show the value over time of an initial investment, say $10,000.  The advantage of this is that it doesn't show stock price at all, so handles splits well.  It can also take into account dividend reinvestment.  Fidelity uses this for their mutual funds, as can be seen here.  Another option would be to compute the stock price as if the split didn't happen.  So if a stock does a 2:1 split, you show double the actual price starting at that point.