JqPlot Axis with BubbleChart

[Ma Pe]

I refer to this example :

http://www.primefaces.org/showcase/ui/bubbleChart.jsf

But i dont want to show Numbers on the x and y axis. I want to write down Text (Citynames) instead of 0,50,100,150 ...-- > Wiesbaden,Frankfurt,Berlin,...

Is know there are ways to do something like this with jqPlot and other chart-types. Is it also possible with the bubbleChart?

Thanks in advance!!