adjust xAxis position
This is possible through axis options.
That's weird... Anyway, setting chart.reflow to false prevents it: http://jsfiddle.net/highcharts/4Cu5f/1/
Arash pajoohande commented
it's good enough Torstein
but trying to resize window, the chart will collapse...
With a bit of modification it works, though you need to count pixels: http://jsfiddle.net/highcharts/4Cu5f/