I noticed a couple of syntax errors, but other than that, it should work fine:
var arr = [
["Blankaholm", "Gamleby"],
["2012-10-23", "2012-10-22"],
["Blankaholm. Under natten har det varit inbrott", "E22 i med Gamleby. Singelolycka. En bilist har."], //<- syntax error here
["57.586174","16.521841"], ["57.893162","16.406090"]
];
console.log(arr[4]); //["57.893162","16.406090"]
console.log(arr[4][0]); //57.893162