<!-- hide this script from non-javascript-enabled browsers
var jahre = new Array(1997,1998,1999,2000,2001);
for (i=0; i<jahre.length; i++)
{
  eval("var _" +jahre[i]+ " = new Array();");
  for (j=1; j<=12; j++)
  {
    eval("_" +jahre[i]+ "[" +j+ "] = new Array();");
  }
}
//-->