I found myself a solution now, really with line charts:
http://chart.apis.google.com/chart?cht=lxy&chxt=x,y&chxl=0:\||1|2|3|4|5|6|7|8||1:|0|5|10|15|20|25|30|35|40&chs=600x400&chd=t:1,2,3|5,10,20|3,4,6|30,10,5&chds=0,9,0,40&chm=x,000000,0,-1,5.0,0|o,cccccc,1,-1,9.0,0&chls=0|0
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