place labels between ticks

how do i place ticks labels between ticks (not below ticks)

for example: when plotting a the stock price over time i would like the x
axis minor ticks to display months and the years to show up between
consecutive x axis major ticks (not just below the major ticks)

---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
   jan feb mar apr may jun jul aug sep oct nov dec jan feb mar apr may jun
jul aug sep
                                2008
2009

works best with fixed fonts

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