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Get names and values from array in Javascript
t = new Object();
t.erg = new Array();
t.erg['random1'] = "something1";
t.erg['random2'] = "something2";
t.erg['random3'] = "something3";
t.erg['random4'] = "something4";

for (x in t.erg) {
  if (t.erg.hasOwnProperty(x)) {
    alert("key is " + x + " value is " + t.erg[x]);
  }
}

var randomVal = "random" + Math.floor(Math.random()*4);

t={
  erg:{
    'random1':'something1',
    'random2':'something2'
  }
}

for(var x in t.erg){
  //in the first round of the loop
  //x holds random1
}