Full dashboard UI mockup

Mockup of a fully functional dashboard I'm working on with our JS dev. The dashboard works this way: 1/ The first visualization, an 'icicle' (see the Infovis demo: thejit.org/static/v20/Jit/Examples/Icicle/…) allows the user to drill down on the data and thus apply sub-population filters to the below charts. 2/ The 'Browser type' pie chart and the 'OS / browser' stacked column chart will display data depending on the continent / country / city selected in the above icicle chart (these two charts are highcharts/ visualizations). 3/ The bottom stacked area chart is independent from the above elements and is also based on the Infovis toolkit. Tool tips, background grid and axis values are missing in this chart mockup; that's why it looks a tad empty

HTML, CSS & JS coding is almost finished but I have my doubts about the header and green banner (btw, credit goes to designmoo.com/members/craigreville/ for the banner) I've used...